Virus (computer)

Virus (computer), self-duplicating computer program that interferes with a computer's hardware or operating system (the basic software that runs the computer). Viruses are designed to duplicate or replicate themselves and to avoid detection. Like any other computer program, a virus must be executed for it to function—that is, it must be located in the computer's memory, and the computer must then follow the virus's instructions. These instructions are called the payload of the virus. The payload may disrupt or change data files, display an irrelevant or unwanted message, or cause the operating system to malfunction.

HOW INFECTIONS OCCUR
Computer viruses activate when the instructions—or executable code—that run programs are opened. Once a virus is active, it may replicate by various means and tries to infect the computer’s files or the operating system. For example, it may copy parts of itself to floppy disks, to the computer’s hard drive, into legitimate computer programs, or it may attach itself to e-mail messages and spread across computer networks by infecting other shared drives. Infection is much more frequent in PCs than in professional mainframe systems because programs on PCs are exchanged primarily by means of floppy disks, e-mail, or over unregulated computer networks.

Viruses operate, replicate, and deliver their payloads only when they are run. Therefore, if a computer is simply attached to an infected computer network or downloading an infected program, it will not necessarily become infected. Typically a computer user is not likely to knowingly run potentially harmful computer code. However, viruses often trick the computer's operating system or the computer user into running the viral program.

Some viruses have the ability to attach themselves to otherwise legitimate programs. This attachment may occur when the legitimate program is created, opened, or modified. When that program is run, so is the virus. Viruses can also reside on portions of the hard disk or floppy disk that load and run the operating system when the computer is started, and such viruses thereby are run automatically. In computer networks, some viruses hide in the software that allows the user to log on (gain access to) the system.

With the widespread use of e-mail and the Internet, viruses can spread quickly. Viruses attached to e-mail messages can infect an entire local network in minutes.

TYPES OF VIRUSES
There are five categories of viruses: parasitic or file viruses, bootstrap sector, multi-partite, macro, and script viruses.

Parasitic or file viruses infect executable files or programs in the computer. These files are often identified by the extension .exe in the name of the computer file. File viruses leave the contents of the host program unchanged but attach to the host in such a way that the virus code is run first. These viruses can be either direct-action or resident. A direct-action virus selects one or more programs to infect each time it is executed. A resident virus hides in the computer's memory and infects a particular program when that program is executed.

Bootstrap-sector viruses reside on the first portion of the hard disk or floppy disk, known as the boot sector. These viruses replace either the programs that store information about the disk's contents or the programs that start the computer. Typically, these viruses spread by means of the physical exchange of floppy disks.

Multi-partite viruses combine the abilities of the parasitic and the bootstrap-sector viruses, and so are able to infect either files or boot sectors. These types of viruses can spread if a computer user boots from an infected diskette or accesses infected files.

Other viruses infect programs that contain powerful macro languages (programming languages that let the user create new features and utilities). These viruses, called macro viruses, are written in macro languages and automatically execute when the legitimate program is opened.

Script viruses are written in script programming languages, such as VBScript (Visual Basic Script) and JavaScript. These script languages can be seen as a special kind of macro language and are even more powerful because most are closely related to the operating system environment. The "ILOVEYOU" virus, which appeared in 2000 and infected an estimated 1 in 5 personal computers, is a famous example of a script virus.

Gas-Electric Hybrids

NEW TECHNOLOGIES



Gas-Electric Hybrids
The Toyota Prius, top, a four-seat hybrid electric vehicle (HEV), was the first HEV to be marketed when Toyota introduced it in Japan in 1997. The Honda Insight, bottom, a two-seat HEV, followed in 1999 when it was sold in both Japan and the United States. The Prius had its U.S. debut in 2000.
Pollution-control laws adopted at the beginning of the 1990s in some of the United States and in Europe called for automobiles that produced better gas mileage with lower emissions. The California Air Resources Board required companies with the largest market shares to begin selling vehicles that were pollution free—in other words, electric. In 1996 General Motors became the first to begin selling an all-electric car, the EV1, to California buyers. The all-electric cars introduced so far have been limited by low range, long recharges, and weak consumer interest.
Engines that run on hydrogen have been tested. Hydrogen combustion produces only a trace of harmful emissions, no carbon dioxide, and a water-vapor by-product. However, technical problems related to the gas’s density and flammability remain to be solved.

Diesel engines burn fuel more efficiently, and produce fewer pollutants, but they are noisy. Popular in trucks and heavy vehicles, diesel engines are only a small portion of the automobile market. A redesigned, quieter diesel engine introduced by Volkswagen in 1996 may pave the way for more diesels, and less pollution, in passenger cars.

While some developers searched for additional alternatives, others investigated ways to combine electricity with liquid fuels to produce low-emissions power systems. Two automobiles with such hybrid engines, the Toyota Prius and the Honda Insight, became available in the late 1990s. Prius hit automobile showrooms in Japan in 1997, selling 30,000 models in its first two years of production. The Prius became available for sale in North America in 2000. The Honda Insight debuted in North America in late 1999. Both vehicles, known as hybrid electric vehicles (HEVs), promised to double the fuel efficiency of conventional gasoline-powered cars while significantly reducing toxic emissions.

Computer control of automobile systems increased dramatically during the 1990s. The central processing unit (CPU) in modern engines manages overall engine performance. Microprocessors regulating other systems share data with the CPU. Computers manage fuel and air mixture ratios, ignition timing, and exhaust-emission levels. They adjust the antilock braking and traction control systems. In many models, computers also control the air conditioning and heating, the sound system, and the information displayed in the vehicle’s dashboard.

Expanded use of computer technology, development of stronger and lighter materials, and research on pollution control will produce better, “smarter” automobiles. In the 1980s the notion that a car would “talk” to its driver was science fiction; by the 1990s it had become reality.

Onboard navigation was one of the new automotive technologies in the 1990s. By using the satellite-aided global positioning system (GPS), a computer in the automobile can pinpoint the vehicle’s location within a few meters. The onboard navigation system uses an electronic compass, digitized maps, and a display screen showing where the vehicle is relative to the destination the driver wants to reach. After being told the destination, the computer locates it and directs the driver to it, offering alternative routes if needed.

Some cars now come equipped with GPS locator beacons, enabling a GPS system operator to locate the vehicle, map its location, and if necessary, direct repair or emergency workers to the scene.

Cars equipped with computers and cellular telephones can link to the Internet to obtain constantly updated traffic reports, weather information, route directions, and other data. Future built-in computer systems may be used to automatically obtain business information over the Internet and manage personal affairs while the vehicle’s owner is driving.

During the 1980s and 1990s, manufacturers trimmed 450 kg (1,000 lb) from the weight of the typical car by making cars smaller. Less weight, coupled with more efficient engines, doubled the gas mileage obtained by the average new car between 1974 and 1995. Further reductions in vehicle size are not practical, so the emphasis has shifted to using lighter materials, such as plastics, aluminum alloys, and carbon composites, in the engine and the rest of the vehicle.

Looking ahead, engineers are devising ways to reduce driver errors and poor driving habits. Systems already exist in some locales to prevent intoxicated drivers from starting their vehicles. The technology may be expanded to new vehicles. Anticollision systems with sensors and warning signals are being developed. In some, the car’s brakes automatically slow the vehicle if it is following another vehicle too closely. New infrared sensors or radar systems may warn drivers when another vehicle is in their “blind spot.”

Catalytic converters work only when they are warm, so most of the pollution they emit occurs in the first few minutes of operation. Engineers are working on ways to keep the converters warm for longer periods between drives, or heat the converters more rapidly.

FUTURE AUTOMOBILE INDUSTRY TRENDS

At the start of the 21st century, the trends of global trade and manufacturing flexibility continue. Computerization continues to be a major part of auto design and manufacture, as do the search for alternative fuels and more efficient automobile designs.
Computerization:
Computer-aided design tools are already used in the automobile industry and will continue to save months of design time and improve the quality of cars. In 1997 Chrysler designed its first paperless cars (1998 and 1999 full-size sedans) using digital model assembly. In the foreseeable future, the design engineer's computer-aided design might guide computer-controlled machinery and reduce the need for blueprints.
Microelectronics will be more fully applied to future automobiles and may become as commonplace as radios are today. On-board systems are becoming available that enable drivers to find destinations through voice-activated navigation or make cellular calls using the computer. These computers can access the Global Positioning System (GPS) and display maps to help drivers avoid congested freeways and find better routes to destinations.

Alternative Fuel Research:
Alternative energy sources for cars, such as natural gas, electricity, ethanol, vegetable oil, sunlight, and water, will vie for consumer use in the future. The Clean Air Act of 1990 and the National Energy Policy Act of 1992 created significant new market opportunities for alternative fuels by requiring government vehicles to use cleaner fuels.

Many vehicle manufacturers now convert existing vehicles or offer factory-built natural gas vehicles (NGV) that burn natural gas and cost less to run than conventionally fueled vehicles do. In many countries, natural gas is cheaper and more available, so NGVs could become popular in the future.

Corn-based gasohol (a combination of unleaded gasoline and ethanol made from corn) reduces fossil energy use by 50 to 60 percent and pollution by 35 to 46 percent. More than 11 percent of all automotive fuels sold in the United States are ethanol-blended, and that percentage may increase in the future. Agricultural sources of fuel have interested carmakers for decades. In 1997 the Veggie Van, a small motor home powered by a diesel motor that runs on a fuel made from used and new vegetable oil (called biodiesel), took a 16,000 km (10,000 mi) journey. The Veggie Van reached speeds up to 105 km/h (65 mph) and achieved a gas mileage of 10.5 km per liter (25 mi per gallon). Some fuel for the Veggie Van was made from used restaurant fryer oil, and its exhaust smelled like french fries.

Many large automakers are now adapting fuel cell technology for automobiles. Fuel cells are cleaner, quieter, and more energy efficient than internal-combustion engines. Fuel cells combine hydrogen and oxygen electrochemically without combustion to supply electricity. Fuel cell engines will likely run on conventional gasoline, but with a fraction of the emissions of a normal engine. The Ford Motor Company announced in December 1997 that it was investing $420 million in fuel cell research.

From 1995 to 1997 Mazda Motor Corporation experimented with a low-pollution hydrogen rotary engine vehicle, which burns hydrogen fuel that will not emit carbon dioxide. Japan reportedly aims to have a hydrogen fuel distribution network in place to support that fuel’s use in transportation by 2010. Scientists are also trying to reduce emissions of existing vehicles and are testing a device that uses electrons to nullify the noxious components of diesel exhaust.

Electric cars, powered by an electric motor and batteries, provide drivers with another alternative. To recharge the batteries, operators plug the car into a 120-volt or 240-volt outlet. A typical electric car averages 60 to 200 km (40 to 100 mi) per charge. Since most car trips are less than 120 km (75 mi), electric cars can help meet the needs of many two- or three-car families. In 1996 GM debuted the EV1, an emission-free electric car that seats two. The EV1 has been slow to catch on, however. Its batteries run out frequently and require several hours to recharge. Moreover, pioneering electric technology makes the EV1 expensive, especially when compared with conventional gasoline-powered cars of comparable size.

Hybrid automobiles combine an electric motor with batteries that are recharged by a small gas- or diesel-powered engine. By relying more on electricity and less on fuel combustion, hybrids have higher fuel efficiency and fewer toxic emissions. Several automakers have experimented with hybrids, and in 1997 Toyota became the first to mass-produce a hybrid vehicle. The first hybrid available for sale in North America was offered by Honda in 1999.

Efficiency:
In September 1993 U.S. president Bill Clinton established the Partnership for a New Generation of Vehicles (PNGV) between the U.S. government and the U.S. auto industry. The partnership aims to create affordable, midsize passenger vehicles that will achieve 34 km per liter (80 mi per gallon) (three times greater than the average achieved in 1994) or better, and reduce air pollution. These new designs feature hybrid engines that combine normal or improved gasoline engines with electric or fuel cell technology for better efficiency. To decrease the overall weight of cars, designers are using materials such as aluminum and plastic, as well as stronger, lighter steel. By the year 2000, major car companies had PNGV concept cars, and they planned to have PNGV production prototypes by 2003.

Materials and Safety:
Future vehicles will likely be made of different materials. For example, improved plastics or composites will reduce car weight, provide fuel economy, allow for smoother surfaces and more complex shapes, and better manage crash energy. As fuel costs increase and the cost of composite body construction decreases, widespread use of plastics could follow. Ceramics, which cut weight and thus improve fuel economy, will increase operating efficiency in applications such as pistons and turbocharger rotors.

Safety will continue to be a concern for automakers. Airbags have saved numerous lives, but they have also been responsible for injuries and deaths of small children, due to the forceful action of the airbags when they inflate. New rules from the U.S. Department of Transportation in 1997 allowed some consumers to remove the airbags or to disable them when small children are riding in front passenger seats. Another point of controversy concerns the recent popularity of large sport-utility vehicles (SUVs) and pickup trucks. When an ordinary car collides with a truck or SUV, studies show that the car passengers are much more likely to suffer injury or death than are the occupants of the larger vehicles. SUVs and trucks are heavier and higher off the ground than ordinary cars and frequently run over the bumpers of ordinary cars during collisions. Industry representatives, government agencies, and insurance groups are currently working on these problems to create practical solutions and increase safety on the road.
The auto industry of the future will be characterized by vanishing boundaries: between countries and companies, between suppliers and manufacturers, between engineering fields, between departments (that is, marketing, design, and finance), between labor and management, and between automotive and consumer electronics. Companies that rapidly adapt to unpredictable and dynamic events will prevail.

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United States (Economy)

INTRODUCTION
United States (Economy), all of the ways goods and services are produced, distributed, and consumed by individuals and businesses in the United States. The U.S. economy is immense. In 1998 it included more than 270 million consumers and 20 million businesses. U.S. consumers purchased more than $5.5 trillion of goods and services annually, and businesses invested over a trillion dollars more for factories and equipment. Over 80 percent of the goods and services purchased by U.S. consumers each year are made in the United States; the rest are imported from other nations. In addition to spending by private households and businesses, government agencies at all levels (federal, state, and local) spend roughly an additional $1.5 trillion a year. In total, the annual value of all goods and services produced in the United States, known as the Gross Domestic Product (GDP), was $9.25 trillion in 1999.

Those levels of production, consumption, and spending make the U.S. economy by far the largest economy the world has ever known—despite the fact that some other nations have far more people, land, or other resources. Through most of the 20th century, U.S. citizens also enjoyed the highest material standards of living in the world. Some nations have higher per capita (per person) incomes than the United States. However, these comparisons are based on international exchange rates, which set the value of a country’s currency based on a narrow range of goods and services traded between nations. Most economists agree that the United States has a higher per capita income based on the total value of goods and services that households consume. American prosperity has attracted worldwide attention and imitation. There are several key reasons why the U.S. economy has been so successful and other reasons why, in the 21st century, it is possible that some other industrialized nations will surpass the U.S. standard of living. To understand those historical and possible future events, it is important first to understand what an economic system is and how that system affects the way people make decisions about buying, selling, spending, saving, investing, working, and taking time for leisure activities.

This article consists of ten major sections. The first section of this article discusses how individual people, business and labor organizations, and social institutions make up the U.S. economic system. Next, the article discusses the production of goods and services. The third section describes the different types of businesses that operate in the United States, such as proprietorships, partnerships, and corporations. It also discusses how entrepreneurs acquire and organize the funding and resources needed to run a business.

Capital, savings, and investment are taken up in the fourth section, which explains how the long-term growth of any economy depends upon the relationship between investments in capital goods (inventories and the facilities and equipment used to make products) and the level of saving in that economy. The next section explains the role money and financial markets play in the economy. Labor markets, the topic of section six, are also extremely important in the U.S. economy, because most people earn their incomes by working for wages and salaries. By the same token, for most firms, labor is the most costly input used in producing the things the firms sell.

The role of government in the U.S. economy is the subject of section seven. The government performs a number of economic roles that private markets cannot provide. It also offers some public services that elected officials believe will be in the best interests of the public. The relationship between the U.S. economy and the world economy is discussed in section eight. Section nine looks at current trends and issues that the U.S economy faces at the start of the 21st century. The final section provides an overview of the kinds of goods and services produced in the United States.

This is one of seven major articles that together provide a comprehensive discussion of the United States of America. For more information on the United States, please see the other six major articles: United States (Overview), United States (Geography), United States (People), United States (Culture), United States (Government), and United States (History).

U.S. ECONOMIC SYSTEM

An economic system refers to the laws and institutions in a nation that determine who owns economic resources, how people buy and sell those resources, and how the production process makes use of resources in providing goods and services. The U.S. economy is made up of individual people, business and labor organizations, and social institutions. People have many different economic roles—they function as consumers, workers, savers, and investors. In the United States, people also vote on public policies and for the political leaders who set policies that have major economic effects. Some of the most important organizations in the U.S. economy are businesses that produce and distribute goods and services to consumers. Labor unions, which represent some workers in collective bargaining with employers, are another important kind of economic organization. So, too, are cooperatives—organizations formed by producers or consumers who band together to share resources—as well as a wide range of nonprofit organizations, including many charities and educational organizations, that provide services to families or groups with special problems or interests.

For the most part, the United States has a market economy in which individual producers and consumers determine the kinds of goods and services produced and the prices of those products. The most basic economic institution in market economies is the system of markets in which goods and services are bought and sold. That is where consumers buy most of the food, clothing, and shelter they use, and any number of things that they simply want to have or that they enjoy doing. Private businesses make and sell most of those goods and services. These markets work by bringing together buyers and sellers who establish market prices and output levels for thousands of different goods and services.

A guiding principle of the U.S. economy, dating back to the colonial period, has been that individuals own the goods and services they make for themselves or purchase to consume. Individuals and private businesses also control the factors of production. They own buildings and equipment, and are free to hire workers, and acquire things that businesses use to produce goods and services. Individuals also own the businesses that are established in the United States. In other economic systems, some or all of the factors of production are owned communally or by the government.

For the most part, U.S. producers decide which goods and services to make and offer to sell, and what prices to charge for those products. Goods are tangible things—things you can touch—that satisfy wants. Examples of goods are cars, clothing, food, houses, and toys. Services are activities that people do for themselves or for other people to satisfy their wants. Examples of services are cutting hair, polishing shoes, teaching school, and providing police or fire protection.

Producers decide which goods and services to make and sell, and how much to ask for those products. At the same time, consumers decide what they will purchase and how much money they are willing to pay for different goods and services. The interaction between competing producers, who attempt to make the highest possible profit, and consumers, who try to pay as little as possible to acquire what they want, ultimately determines the price of goods and services.

In a market economy, government plays a limited role in economic decision making. However, the United States does not have a pure market economy, and the government plays an important role in the national economy. It provides services and goods that the market cannot provide effectively, such as national defense, assistance programs for low-income families, and interstate highways and airports. The government also provides incentives to encourage the production and consumption of certain types of products, and discourage the production and consumption of others. It sets general guidelines for doing business and makes policy decisions that affect the economy as a whole. The government also establishes safety guidelines that regulate consumer products, working conditions, and environmental protection.

Factors of Production

The factors of production, which in the United States are controlled by individuals, fall into four major categories: natural resources, labor, capital, and entrepreneurship.

Natural Resources: Natural resources, which come directly from the land, air, and sea, can satisfy people’s wants directly (for example, beautiful mountain scenery or a clear lake used for fishing and swimming), or they can be used to produce goods and services that satisfy wants (such as a forest used to make lumber and furniture).

The United States has many natural resources. They include vast areas of fertile land for growing crops, extensive coastlines with many natural harbors, and several large navigable rivers and lakes on which large ships and barges carry products to and from most regions of the nation. The United States has a generally moderate climate, and an incredible diversity of landscapes, plants, and wildlife.

Labor: Labor refers to the routine work that people do in their jobs, whether it is performing manual labor, managing employees, or providing skilled professional services. Manual labor usually refers to physical work that requires little formal education or training, such as shoveling dirt or moving furniture. Managers include those who supervise other workers. Examples of skilled professionals include doctors, lawyers, and dentists.

Of the 270 million people living in the United States in 1998, nearly 138 million adults were working or actively looking for work. This is the nation's labor force, which includes those who work for wages and salaries and those who file government tax forms for income earned through self-employment. It does not include homemakers or others who perform unpaid labor in the home, such as raising, caring for, and educating children; preparing meals and maintaining the home; and caring for family members who are ill. Nor, of course, does it count those who do not report income to avoid paying taxes, in some cases because their work involves illegal activities.

Capital: Capital includes buildings, equipment, and other intermediate products that businesses use to make other goods or services. For example, an automobile company builds factories and buys machines to stamp out parts for cars; those buildings and machines are capital. The value of capital goods being used by private businesses in the United States in the late 1990s is estimated to be more than $11 trillion. Roughly half of that is equipment and the other half buildings or other structures. Businesses have additional capital investments in their inventories of finished products, raw materials, and partially completed goods.

Entrepreneurship: Entrepreneurship is an ability some people have to accept risks and combine factors of production in order to produce goods and services. Entrepreneurs organize the various components necessary to operate a business. They raise the necessary financial backing, acquire a physical site for the business, assemble a team of workers, and manage the overall operation of the enterprise. They accept the risk of losing the money they spend on the business in the hope that eventually they will earn a profit. If the business is successful, they receive all or some share of the profits. If the business fails, they bear some or all of the losses.

Many people mistakenly believe that anyone who manages a large company is an entrepreneur. However, many managers at large companies simply carry out decisions made by higher-ranking executives. These managers are not entrepreneurs because they do not have final control over the company and they do not make decisions that involve risking the companies resources. On the other hand, many of the nation’s entrepreneurs run small businesses, including restaurants, convenience stores, and farms. These individuals are true entrepreneurs, because entrepreneurship involves not merely the organization and management of a business, but also an individual’s willingness to accept risks in order to make a profit.

Throughout its history, the United States has had many notable entrepreneurs, including 18th-century statesman, inventor, and publisher Benjamin Franklin, and early-20th-century figures such as inventor Thomas Edison and automobile producer Henry Ford. More recently, internationally recognized leaders have emerged in a number of fields: Bill Gates of Microsoft Corporation and Steve Jobs of Apple Computer in the computer industry; Sam Walton of Wal-Mart in retail sales; Herb Kelleher and Rollin King of Southwest Airlines in the commercial airline business; Ray Kroc of MacDonald’s, Harland Sanders of Kentucky Fried Chicken (KFC), and Dave Thomas of Wendy’s in fast food; and in motion pictures, Michael Eisner of the Walt Disney Company as well as a number of entrepreneurs at smaller independent production studios that developed during the 1980s and 1990s.

Acquiring the Factors of Production

All four factors of production—natural resources, labor, capital, and entrepreneurship—are traded in markets where businesses buy these inputs or productive resources from individuals. These are called factor markets. Unlike a grocery market, which is a specific physical store where consumers purchase goods, the markets mentioned above comprise a wide range of locations, businesses, and individuals involved in the exchange of the goods and services needed to run a business.

Businesses turn to the factor markets to acquire the means to make goods and services, which they then try to sell to consumers in product or output markets. For example, an agricultural firm that grows and sells wheat can buy or rent land from landowners. The firm may shop for this natural resource by consulting real estate agents and farmers throughout the Midwest. This same firm may also hire many kinds of workers. It may find some of its newly hired workers by recruiting recent graduates of high schools, colleges, or technical schools. But its market for labor may also include older workers who have decided to move to a new area, or to find a new job and employer where they currently live.

Firms often buy new factories and machines from other firms that specialize in making these kinds of capital goods. That kind of investment often requires millions of dollars, which is usually financed by loans from banks or other financial institutions.

Markets and the Problem of Scarcity

Markets and the Problem of Scarcity
A basic principle in every economic system—even one as large and wealthy as the U.S. economy—is that few, if any, individuals ever satisfy all of their wants for goods and services. That means that when people buy goods and services in different markets, they will not be able to buy all of the things they would like to have. In fact, if everyone did have all of the things they wanted, there would be no reason for anyone to worry about economic problems. But no nation has ever been able to provide all of the goods and services that its citizens wanted, and that is true of the U.S. economy as much as any other.

Scarcity is also the reason why making good economic choices is so important, because even though it is not possible to satisfy everyone’s wants, all people are able to satisfy some of their wants. Similarly, every nation is able to provide some of the things its citizens want. So the basic problem facing any nation’s economy is how to make sure that the resources available to the people in the nation are used to satisfy as many as possible of the wants people care about most.

The U.S. economy, with its system of private ownership, has an extensive set of markets for final products and for the factors of production. The economy has been particularly successful in providing material goods and services to most of its citizens. That is even more striking when results in the U.S. economy are compared with those of other nations and economic systems. Nevertheless, most U.S. consumers say they would like to be able to buy and use more goods and services than they have today. And some U.S. citizens are calling for significant changes in how the economic system works, or at least in how the purchasing power and the goods and services in the system are divided up among different individuals and families.

Not surprisingly, low-income families would like to receive more income, and often favor higher taxes on upper-income households. But many upper-income families complain that government already taxes them too much, and some argue that government is taking over too many things in the economy that were, in the past, left up to individuals, families, and private firms or charities.

These debates take place because of the problem of scarcity. For individuals and governments, resources that satisfy a particular want cannot be used to satisfy other wants. Therefore, deciding to satisfy one want means paying the cost of not satisfying another. Such choices take place every time the government decides how to spend its tax revenues.

What Are Markets?

Goods and services are traded in markets. Usually a market is a physical place where buyers and sellers meet to make exchanges, once they have agreed on a price for the product. One kind of marketplace is a grocery store, where people go to buy food and household products. However, many markets are not confined to specific locations. In a broader sense, markets include all the places and sources where goods and services are exchanged. For example, the labor market does not exist in a specific physical building, as does a grocery market. Instead, the term labor market describes a multitude of individuals offering their labor for sale as well as all the businesses searching for employees.

Traders do not always have to meet in person to buy and sell. Markets can operate via technology, such as a telephone line or a computer site. For example, stocks and other financial securities have long been traded electronically or by telephone. It is becoming increasingly common in the United States for many other kinds of goods and services to be sold this way. For instance, many people today use the Internet—the worldwide computer-based network of information systems—to buy airline tickets, make hotel reservations, and rent a car for their vacation. Other people buy and sell items ranging from books, clothing, and airline tickets to baseball cards and other rare collectibles over the Internet. Although these Internet buyers and sellers may never meet face to face the way buyers and sellers do in more traditional markets, these markets share certain basic features.

How a Single Market Works

Buyers hope to buy at low prices and will purchase more units of a product at lower prices than they do at higher prices. Sellers are just the opposite. They hope to sell at high prices, and typically they will be willing to produce and sell more units of a product at higher prices than at lower prices.

The price for a product is determined in the market if prices are allowed to rise and fall, and are not legally required to be above some minimum price floor or below some maximum price ceiling. When a product, for example, a personal computer, reaches the market, consumers learn what producers want to charge for it and producers learn what consumers are willing to pay. The interaction of producers and consumers quickly establishes what the market price for the computer will actually be. Some people who were considering buying a computer decide that the price is higher than they are willing to pay. And some producers may determine that consumers are not willing to pay a price high enough for them profitably to produce and sell this computer.

But all of the buyers who are willing and able to pay the market price get the computer, and all of the sellers willing and able to produce it for this price find buyers. If more consumers want to buy a computer at a specific market price than there are suppliers are willing to sell at that price—or in other words, if the quantity demanded is greater than the quantity supplied—the price for the computer increases. When producers try to sell more of their computers at a price higher than consumers are willing to buy, the quantity supplied exceeds the quantity demanded and the price falls.

The price stops rising or falling at the price where the amount consumers are willing and able to buy is just equal to the amount sellers are willing and able to produce and sell. This is called the market clearing price. Market clearing prices for many goods and services change frequently, for reasons that will be discussed below. But some market prices are stable for long periods of time, such as the prices of candy bars and sodas sold in vending machines, and the prices of pizzas and hamburgers. Most buyers of these products have come to know the general price they will have to pay for these items. Sellers know what prices they can charge, given what consumers will pay and considering the competition they face from other sellers of identical, or very similar, products.

System of Markets

System of Markets for All Goods and Services
How markets determine price is simple enough to understand for a single good or service in a single location. But consider what happens when there are markets for nearly all of the goods and services produced and consumed in an economy, across the entire country. In that context, this reasonably simple process of setting market prices allows an economic system as large and complex as the U.S. economy to operate with great efficiency and a high degree of freedom for consumers and producers.

Efficiency here means producing what consumers want to buy, at prices that are as low as they can be for producers to stay in business. And it turns out this efficiency is directly linked to the freedom that buyers and sellers have in a market economy. No central authority has to decide how many shirts or cars or sandwiches to produce each day, or where to produce them, or what price to charge for them. Instead, consumers spend their money for the products that give them the most satisfaction, and they try to find the best deal they can in terms of price, quality, convenience, assurances that defective products will be replaced or repaired, or other considerations.

What consumers are willing and able to buy tells producers what they should produce, if they hope to make a profit. Usually consumers have many options to choose from, because more than one producer offers the same or reasonably similar products (such as two or more kinds of cars, colas, and carpets). Producers then compete energetically for the dollars that consumers spend.

Competition among producers determines the best ways to produce a good or service. For example, in the early 1900s automobiles were made largely by hand, one at a time. But once Henry Ford discovered how to lower the cost of producing cars by using assembly lines, other car makers had to adopt the same production methods or be driven out of business (as many were).

Competition also determines what features and quality standards go into products. And competition holds down the costs of production because producers know that consumers compare their prices to the prices charged by other firms and for other products they might buy. In markets where a large number of producers compete, inefficient producers will be driven out of the market.

For example, at one time most towns and cities had independently owned cafes and drive-in restaurants that sold hamburgers, french fries, and soft drinks. Some of these businesses are still operating, but many closed down after larger fast-food chains began opening local franchises all around the nation, with well-known product standards and relatively low prices. The increased competition led to prices that were too low for many of the old cafes and drive-ins to make a profit. The private cafes that did survive were able to meet that level of efficiency, or they managed to make their products different enough from the national chains to keep their customers.

Prices for goods and services can only fall so far, however. Even the most efficient producers have to pay for the natural resources, labor, capital, and entrepreneurship they use to make and sell products. The market price cannot stay below the level of those costs for long without driving all of the producers out of this market. Therefore, if consumers want to buy some good or service not just today but also in the future, they have to pay a price at least high enough to cover the costs of producing it, including enough profit to make it worthwhile for sellers to stay in that market.

Once market prices for various goods and services are set, consumers are free to choose what to buy, and producers are free to choose what to produce and sell. They both follow their self-interest and do what makes them as well off as they can be. When all buyers and sellers do that in an economic system of competitive markets, the overall economy will also be very efficient and responsive to individual preferences.

This economic process is extremely decentralized. For example, it is likely that no one person or government agency knows how many corned beef sandwiches are sold in any large U.S. city on any given day. Individual sellers decide how many sandwiches they are likely to sell and arrange to have enough meat and bread available to meet the demand from their customers.

Consumers usually do not make up their mind about what to eat for lunch or dinner until they walk into the restaurant, grocery store, or sandwich shop. But they know they can go to several different places and choose many different things to eat and drink, while individual sellers know about how much they are likely to sell on an average business day.

Other businesses sell bread and meat and drinks to the restaurants and grocers, but they do not really know how many different sandwiches the different food stores are selling either. They only know how much bread and meat they need to have on hand to satisfy the orders they get from their customers.

Each buyer and seller knows his or her small part of the market very well and makes choices carefully to avoid wasting money and other resources. When everyone acts this carefully while facing competition from other consumers or producers, the overall system uses its scarce resources very efficiently. Efficiency implies two things here: taking into account the preferences and alternative choices that individual buyers and sellers face, and producing goods and services at the lowest possible cost.

How and Why Market Prices Change

Another advantage of any competitive market system is a high level of flexibility and speed in responding to changing economic conditions. In economies where government agencies and central planners set prices, it often takes much longer to adjust prices to new conditions. In the last decades of the 20th century, the U.S. market economy has made these adjustments very quickly, even compared with other market economies in Western Europe, Canada, and Japan.

Market prices change whenever something causes a change in demand (the amount people are willing to buy at different prices) or a change in supply (the amount producers are willing and able to make and sell at different prices).

Because these changes can occur rapidly, with little or no advance warning, it is important for both consumers and producers to understand what can cause prices to rise and fall. Those who anticipate price changes correctly can often gain financially from their foresight. Those who do not understand why prices have changed are likely to feel bewildered and frustrated, and find it more difficult to know how to respond to changing prices. Market economies are, in fact, sometimes called price systems. It is important to understand why prices rise and fall to understand how a market system works.

Changes in Demand

Demand for most products changes whenever there is a significant change in the level of consumers’ income. In the United States, incomes have risen substantially over the past 200 years. As that happened, the demand for most goods and services also increased. There are, however, a few products that people buy less of as income falls. Examples of these inferior goods include low quality foods and fabrics.

Demand for a product also changes when the price of a substitute product changes. For example, if the price for one brand of blue jeans sharply increases while other brands do not, many consumers will switch to the other brands, so the demand for those brands will increase. Conversely, if the price for beef drops, then many people will buy less pork and chicken.

Some products are complements rather than substitutes. Complements are products that are consumed together, for example cameras and film, or tennis balls and tennis rackets. When the price of a complementary good rises, the demand for a product falls. For example, if the price of cameras rises, the demand for film will fall. On the other hand, if the price of a complementary good falls, the demand for a product will rise. If the price of tennis rackets falls, for example, more people will buy rackets and the demand for tennis balls will increase.

Demand can also increase or decrease as a product goes in or out of style. When famous athletes or movie stars create a popular new look in clothing or tennis shoes, demand soars. When something goes out of style, it soon disappears from stores, and eventually from people’s closets, too.

If people expect the price of something to go up in the future, they start to buy more of the product now, which increases demand. If they believe the price is going to fall in the future, they wait to buy and hope they were right. Sometimes these choices involve very serious decisions and large amounts of money. For example, people who buy stocks on the stock market are hoping that prices will rise, while at least some of the people selling those stocks expect the prices to fall. But not all economic decisions are this serious. For example, in the 1970s there was a brief episode when toilet paper disappeared from the shelves of grocery stores, because people were afraid that there were going to be shortages and rising prices. It turns out that some of these unfounded fears were based on remarks made by a comedian on a late-night talk show.

The final factor that affects the demand for most goods and services is the number of consumers in the market for a product. In cities where population is rising rapidly, the demand for houses, food, clothing, and entertainment increases dramatically. In areas where population is falling—as it has in many small towns where farm populations are shrinking—demand for these goods and services falls.

Changes in Supply

The supply of most products is also affected by a number of factors. Most important is the cost of producing products. If the price of natural resources, labor, capital, or entrepreneurship rises, sellers will make less profit and will not be as motivated to produce as many units as they were before the cost of production increased. On the other hand, when production costs fall, the amount producers are willing and able to sell increases.

Technological change also affects supply. A new invention or discovery can allow producers to make something that could not be made before. It could also mean that producers can make more of a product using the same or fewer inputs. The most dramatic example of technological change in the U.S. economy over the past few decades has been in the computer industry. In the 1990s, small computers that people carry to and from work each day were more powerful and many times less expensive than computers that filled entire rooms just 20 to 30 years earlier.

Opportunities to make profits by producing different goods and services also affect the supply of any individual product. Because many producers are willing to move their resources to completely different markets, profits in one part of the economy can affect the supply of almost any other product. For example, if someone running a barbershop decided to sign a contract to provide and operate the machines that clean runways at a large airport, this would decrease the supply of haircutting services and increase the supply of runway sweeping services.

When suppliers believe the price of the good or service they provide is going to rise in the future, they often wait to sell their product, reducing the current supply of the product. On the other hand, if they believe that the price is going to fall in the future, they try to sell more today, increasing the current supply. We see this behavior by large and small sellers. Examples include individuals who are thinking about selling a house or car, corn and wheat farmers deciding whether to sell or store their crops, and corporations selling manufactured products or reserves of natural resources.

Finally, the number of sellers in a market can also affect the level of supply. Generally, markets with a larger number of sellers are more competitive and have a greater supply of the product to be sold than markets with fewer sellers. But in some cases, the technology of producing a product makes it more efficient to produce large quantities at just a few production sites, or perhaps even at just one. For example, it would not make sense to have two or more water and sewage companies running pipes to every house and business in a city. And automobiles can be produced at a much lower cost in large plants than in small ones, because large plants can take greater advantage of assembly-line production methods.

All these different factors can lead to changes in what consumers demand and what producers supply. As a result, on any given day prices for some things will be rising and those for others will be falling. This creates opportunities for some individuals and firms, and problems for others. For example, firms producing goods for which the demand and the price are falling may have to lay off workers or even go out of business. But for the economy as a whole, allowing prices to rise and fall quickly in response to changes in any of the market forces that affect supply and demand offers important advantages. It provides an extremely flexible and decentralized system for getting goods and services produced and delivered to households while responding to a vast number of unpredictable changes.

PRODUCTION OF GOODS AND SERVICES

PRODUCTION OF GOODS AND SERVICES
Before goods and services can be distributed to households and consumed, they must be produced by someone, or by some business or organization. In the United States and other market economies, privately owned firms produce most goods and services using a variety of techniques. One of the most important is specialization, in which different firms make different kinds of products and individual workers perform specific jobs within a company.

Successful firms earn profits for their owners, who accept the risk of losing money if the products the firms try to sell are not purchased by consumers at prices high enough to cover the costs of production. In the modern economy, most firms and workers have found that to be competitive with other firms and workers they must become very good at producing certain kinds of goods and services.

Most businesses in the United States also operate under one of three different legal forms: corporations, partnerships, or sole proprietorships. Each of these forms has certain advantages and disadvantages. Because of that, these three types of business organizations often operate in different kinds of markets. For example, most firms with large amounts of money invested in factories and equipment are organized as corporations.

Specialization and the Division of Labor
In earlier centuries, especially in frontier areas, families in the United States were much more self-sufficient, producing for themselves most of the goods and services they consumed. But as the U.S. population and economy grew, it became easier for people to buy more and more things in the marketplace. Once that happened, people faced a choice they still face today: In terms of time, money, and other things that they could do, is it less expensive to make something themselves or to let someone else produce it and buy it from them?

Over the years, most people and businesses realized that they could make better use of their time and resources by concentrating on one particular kind of work, rather than trying to produce for themselves all the items they want to consume. Most people now work in jobs where they do one kind of work; they are carpenters, bankers, cooks, mechanics, and so forth. Likewise, most businesses produce only certain kinds of goods or services, such as cars, tacos, or gardening services. This feature of production is known as specialization. A high degree of specialization is a key part of the economic system in the United States and all other industrialized economies. When businesses specialize, they focus on providing a particular product or type of product. For instance, some large companies produce only automobiles and trucks, or even special parts of cars and trucks, such as tires.



At almost all businesses, when goods and services are produced, labor is divided among workers, with different employees responsible for completing different tasks. This is known as division of labor. For example, the individual parts of cars and televisions are made by many different workers and then put together in an assembly line. Other well-known examples of this specialization and division of labor are seen in the production of computers and electrical appliances. But even kitchens in large restaurants have different chefs for different items, and professional workers such as doctors and dentists have also become more specialized during the past century.

Separation of Ownership and Control

Separation of Ownership and Control
The advantages of limited liability and of an unlimited number of years to operate have made corporations the dominant form of business for large-scale enterprises in the United States. However, there is one major drawback to this form of business. With sole proprietorships, the owners of the business are usually the same people who manage and operate the business. But in large corporations, corporate officers manage the business on behalf of the stockholders. This separation of management and ownership creates a potential conflict of interest. In particular, managers may care about their salaries, fringe benefits, or the size of their offices and support staffs, or perhaps even the overall size of the business they are running, more than they care about the stockholders’ profits.

The top managers of a corporation are appointed or dismissed by a corporation’s board of directors, which represents stockholders’ interests. However, in practice, the board of directors is often made up of people who were nominated by the top managers of the company. Members of the board of directors are elected by a majority of voting stockholders, but most stockholders vote for the nominees recommended by the current board members. Stockholders can also vote by proxy—a process in which they authorize someone else, usually the current board, to decide how to vote for them.

There are, however, two strong forces that encourage the managers of a corporation to act in stockholders’ interests. One is competition. Direct competition from other firms that sell in the same markets forces a corporation’s managers to make sound business decisions if they want the business to remain competitive and profitable. The second is the threat that if the corporation does not use its resources efficiently, it will be taken over by a more efficient company that wants control of those resources. If a corporation becomes financially unsound or is taken over by a competing company, the top managers of the firm face the prospect of being replaced. As a result, corporate managers will often act in the best interests of a corporation’s stockholders in order to preserve their own jobs and incomes.

In practice, the most common way for a takeover to occur is for one company to purchase the stock of another company, or for the two companies to merge by legal agreement under some new management structure. Stock purchases are more common in what are called hostile takeovers, where the company that is being taken over is fighting to remain independent. Mergers are more common in friendly takeovers, where two companies mutually agree that it makes sense for the companies to combine. In 1996 there were over $556.3 billion worth of mergers and acquisitions in the U.S. economy. Examples of mergers include the purchase of Lotus Development Corporation, a computer software company, by computer manufacturer International Business Machines Corporation (IBM) and the acquisition of Miramax Films by entertainment and media giant Walt Disney Company.

Takeovers by other firms became commonplace in the closing decades of the 20th century, and some research indicates that these takeovers made firms operate more efficiently and profitably. Those outcomes have been good news for shareholders and for consumers. In the long run, takeovers can help protect a firm’s workers, too, because their jobs will be more secure if the firm is operating efficiently. But initially takeovers often result in job losses, which force many workers to relocate, retrain, or in some cases retire sooner than they had planned. Such workforce reductions happen because if a firm was not operating efficiently, it was probably either operating in markets where it could not compete effectively, or it was using too many workers and other inputs to produce the goods and services it was selling. Sometimes corporate mergers can result in job losses because management combines and streamlines departments within the newly merged companies. Although this streamlining leads to greater efficiency, it often results in fewer jobs. In many cases, some workers are likely to be laid off and face a period of unemployment until they can find work with another firm.

How Corporations Raise Funds for Investment

By investing in new issues of a company’s stock, shareholders provide the funds for a company to begin new or expanded operations. However, most stock sales do not involve new issues of stock. Instead, when someone who owns stock decides to sell some or all of their shares, that stock is typically traded on one of the national stock exchanges, which are specialized markets for buying and selling stocks. In those transactions, the person who sells the stock—not the corporation whose stock is traded—receives the funds from that sale.

An existing corporation that wants to secure funds to expand its operations has three options. It can issue new shares of stock, using the process described earlier. That option will reduce the share of the business that current stockholders own, so a majority of the current stockholders have to approve the issue of new shares of stock. New issues are often approved because if the expansion proves to be profitable, the current stockholders are likely to benefit from higher stock prices and increased dividends. Dividends are corporate profits that some companies periodically pay out to shareholders.

The second way for a corporation to secure funds is by borrowing money from banks, from other financial institutions, or from individuals. To do this the corporation often issues bonds, which are legal obligations to repay the amount of money borrowed, plus interest, at a designated time. If a corporation goes out of business, it is legally required to pay off any bonds it has issued before any money is returned to stockholders. That means that stocks are riskier investments than bonds. On the other hand, all a bondholder will ever receive is the amount of money specified in the bond. Stockholders can enjoy much larger returns, if the corporation is profitable.

The final way for a corporation to pay for new investments is by reinvesting some of the profits it has earned. After paying taxes, profits are either paid out to stockholders as dividends or held as retained earnings to use in running and expanding the business. Those retained earnings come from the profits that belong to the stockholders, so reinvesting some of those profits increases the value of what the stockholders own and have risked in the business, which is known as stockholders’ equity. On the other hand, if the corporation incurs losses, the value of what the stockholders own in the business goes down, so stockholders’ equity decreases.

Entrepreneurs and Profits
Entrepreneurs raise money to invest in new enterprises that produce goods and services for consumers to buy—if consumers want these products more than other things they can buy. Entrepreneurs often make decisions on which businesses to pursue based on consumer demands. Making decisions to move resources into more profitable markets, and accepting the risk of losses if they make bad decisions—or fail to produce products that stand the test of competition—is the key role of entrepreneurs in the U.S. economy.

Profits are the financial incentives that lead business owners to risk their resources making goods and services for consumers to buy. But there are no guarantees that consumers will pay prices high enough to cover a firm’s costs of production, so there is an inherent risk that a firm will lose money and not make profits. Even during good years for most businesses, about 70,000 businesses fail in the United States. In years when business conditions are poor, the number approaches 100,000 failures a year. And even among the largest 500 U.S. industrial corporations, a few of these firms lose money in any given year.
Entrepreneurs invest money in firms with the expectation of making a profit. Therefore, if the profits a company earns are not high enough, entrepreneurs will not continue to invest in that firm. Instead, they will invest in other companies that they hope will be more profitable. Or if they want to reduce their risk, they can put their money into savings accounts where banks guarantee a minimum return. They can also invest in other kinds of financial securities (such as government or corporate bonds) that are riskier than savings accounts, but less risky than investments in most businesses. Generally, the riskier the investment, the higher the return investors will require to invest their money

CAPITAL, SAVINGS, AND INVESTMENT

CAPITAL, SAVINGS, AND INVESTMENT
In the United States and in other market economies, financial firms and markets channel savings into capital investments. Financial markets, and the economy as a whole, work much better when the value of the dollar is stable, experiencing neither rapid inflation nor deflation. In the United States, the Federal Reserve System functions as the central banking institution. It has the primary responsibility to keep the right amount of money circulating in the economy.

Investments are one of the most important ways that economies are able to grow over time. Investments allow businesses to purchase factories, machines, and other capital goods, which in turn increase the production of goods and services and thus the standard of living of those who live in the economy. That is especially true when capital goods incorporate recently developed technologies that allow new goods and services to be produced, or existing goods and services to be produced more efficiently with fewer resources.

Investing in capital goods has a cost, however. For investment to take place, some resources that could have been used to produce goods and services for consumption today must be used, instead, to make the capital goods. People must save and reduce their current consumption to allow this investment to take place. In the U.S. economy, these are usually not the same people or organizations that use those funds to buy capital goods. Banks and other financial institutions in the economy play a key role by providing incentives for some people to save, and then lend those funds to firms and other people who are investing in capital goods.

Interest rates are the price someone pays to borrow money. Savings institutions pay interest to people who deposit funds with the institution, and borrowers pay interest on their loans. Like any other price in a market economy, supply and demand determine the interest rate. The demand for money depends on how much money people and organizations want to have to meet their everyday expenses, how much they want to save to protect themselves against times when their income may fall or their expenses may rise, and how much they want to borrow to invest. The supply of money is largely controlled by a nation’s central bank—which in the United States is the Federal Reserve System. The Federal Reserve increases or decreases the money supply to try to keep the right amount of money in the economy. Too much money leads to inflation. Too little results in high interest rates that make it more expensive to invest and may lead to a slowdown in the national economy, with rising levels of unemployment.

Providing Funds for Investments in Capital
To take advantage of specialization and economies of scale, firms must build large production facilities that can cost hundreds of millions of dollars. The firms that build these plants raise some funds with new issues of stock, as described above. But firms also borrow huge sums of money every year to undertake these capital investments. When they do that, they compete with government agencies that are borrowing money to finance construction projects and other public spending programs, and with households that are borrowing money to finance the purchase of housing, automobiles, and other goods and services.

Savings play an important role in the lending process. For any of this borrowing to take place, banks and other lenders must have funds to lend out. They obtain these funds from people or organizations that are willing to deposit money in accounts at the bank, including savings accounts. If everyone spent all of the income they earned each year, there would be no funds available for banks to lend out.

Among the three major sectors of the U.S. economy—households, businesses, and government—only households are net savers. In other words, households save more money than they borrow. Conversely, businesses and government are net borrowers. A few businesses may save more than they invest in business ventures. However, overall, businesses in the United States, like businesses in virtually all countries, invest far more than they save. Many companies borrow funds to finance their investments. And while some local and state governments occasionally run budget surpluses, overall the government sector is also a large net borrower in the U.S. economy. The government borrows money by issuing various forms of bonds. Like corporate bonds, government bonds are contractual obligations to repay what is borrowed, plus some specified rate of interest, at a specified time.

Matching Borrowers and Lenders in Financial Markets
Households save money for several reasons: to provide a cushion against bad times, as when wage earners or others in the household become sick, injured, or disabled; to pay for large expenditures such as houses, cars, and vacations; to set aside money for retirement; or to invest. Banks and other financial institutions compete for households’ savings deposits by paying interest to the savers. Then banks lend those funds out to borrowers at a higher rate of interest than they pay to savers. The difference between the interest rates charged to borrowers and paid to savers is the main way that banks earn profits.

Of course banks must also be careful to lend the money to people and firms that are creditworthy—meaning they will be able to repay the loans. The creditworthiness of the borrower is one reason why some kinds of loans have higher rates of interest than others do. Short-term loans made to people or businesses with a long history of stable income and employment, and who have assets that can be pledged as collateral that will become the bank’s property if a loan is not repaid, will receive the lowest interest rates. For example, well-established firms such as AT&T often pay what is called the bank’s prime rate—the lowest available rate for business loans—when they borrow money. New, start-up companies pay higher rates because there is a greater risk they will default on the loan or even go out of business.

Other kinds of loans also have greater risks of default, so banks and other lenders charge different rates of interest. Mortgage loans are backed by the collateral of the property the loan was used to purchase. If someone does not pay his or her mortgage, the bank has the right to sell the property that was pledged as collateral and to collect the proceeds as payment for what it is owed. That means the bank’s risks are lower, so interest rates on these loans are typically lower, too. The money that is loaned to people who do not pay off the balances on their credit cards every month represents a greater risk to banks, because no collateral is provided. Because the bank does not hold any title to the consumer’s property for these loans, it charges a higher interest rate than it charges on mortgages. The higher rate allows the bank to collect enough money overall so that it can cover its losses when some of these riskier loans are not repaid.

If a bank makes too many loans that are not repaid, it will go out of business. The effects of bank failures on depositors and the overall economy can be very severe, especially if many banks fail at the same time and the deposits are not insured. In the United States, the most famous example of this kind of financial disaster occurred during the Great Depression of the 1930s, when a large number of banks failed. Many other businesses also closed and many people lost both their jobs and savings.

Bank failures are fairly rare events in the U.S. economy. Banks do not want to lose money or go out of business, and they try to avoid making loans to individuals and businesses who will be unable to repay them. In addition, a number of safeguards protect U.S. financial institutions and their customers against failures. The Federal Deposit Insurance Corporation (FDIC) insures most bank and savings and loan deposits up to $100,000. Government examiners conduct regular inspections of banks and other financial institutions to try to ensure that these firms are operating safely and responsibly.

A Money and the Value of Money

MONEY AND FINANCIAL MARKETS
A Money and the Value of Money

Money is anything generally accepted as final payment for goods and services. Throughout history many things have been used around the world as money, including gold, silver, tobacco, cattle, and rare feathers or animal skins. In the U.S. economy today, there are three basic forms of money: currency (dollar bills), coins, and checks drawn on deposits at banks and other financial firms that offer checking services. Most of the time, when households, businesses, and government agencies pay their bills they use checks, but for smaller purchases they also use currency or coins.

People can change the type of the money they hold by withdrawing funds from their checking account to receive currency or coins, or by depositing currency and coins in their checking accounts. But the money that people have in their checking accounts is really just the balance in that account, and most of those balances are never converted to currency or coins. Most people deposit their paychecks and then write checks to pay most of their bills. They only convert a small part of their pay to currency and coins. Strange as it seems, therefore, most money in the U.S. economy is just the dollar amount written on checks or showing in checking account balances. Sometimes, economists also count money in savings accounts in broader measures of the U.S. money supply, because it is easy and inexpensive to move money from savings accounts to checking accounts





Most people are surprised to learn that when banks make loans, the loans create new money in the economy. As we’ve seen, banks earn profits by lending out some of the money that people have deposited. A bank can make loans safely because on most days, the amount some customers are depositing in the bank is about the same amount that other customers are withdrawing. A bank with many customers holding a lot of deposits can lend out a lot of money and earn interest on those loans. But of course when that happens, the bank does not subtract the amount it has loaned out from the accounts of the people who deposited funds in savings and checking accounts. Instead, these depositors still have the money in their accounts, but now the people and firms to whom the bank has loaned money also have that money in their accounts to spend. That means the total amount of money in the economy has increased. This process is called fractional reserve banking, because after making loans the bank retains only a fraction of its deposits as reserves. The bank really could not pay all of its depositors without calling in the loans it has made. It also means that money is created when banks make loans but destroyed when loans are paid off.
At one time the dollar, like most other national currencies, was backed by a specified quantity of gold or silver held by the federal government. At that time, people could redeem their dollars for gold or silver. But in practice paper currency is much easier to carry around than large amounts of gold or silver. Therefore, most people have preferred to hold paper money or checking balances, as long as paper currency and checks are accepted as payment for goods and services and maintain their value in terms of the amount of goods and services they can buy.

Eventually governments around the world also found it expensive to hold and guard large quantities of gold or silver. As foreign trade grew, governments found it especially difficult to transfer gold and silver to other countries that decided to redeem paper money acquired through international trade. They, too, changed to using paper currencies and writing checks against deposits in accounts. In 1971 the United States suspended the international payment of gold for U.S. currency. This action effectively ended the gold standard, the name for this official link between the dollar and the price of gold. Since then, there has been no official link between the dollar and a set price for gold, or to the amount of gold or other precious metals held by the U.S. government.

The real value of the dollar today depends only on the amount of goods and services a dollar can purchase. That purchasing power depends primarily on the relationship between the number of dollars people are holding as currency and in their checking and savings accounts, and the quantity of goods and services that are produced in the economy each year. If the number of dollars increases much more rapidly than the quantity of goods and services produced each year, or if people start spending the dollars they hold more rapidly, the result is likely to be inflation. Inflation is an increase in the average price of all goods and services. In other words, it is a decrease in the value of what each dollar can buy.

The Federal Reserve System and Monetary Policy

Governments often attempt to reduce inflation by controlling the supply of money. Consequently, organizations that control how much money is issued in an economy play a major role in how the economy performs, in terms of prices, output and employment levels, and economic growth. In the United States, that organization is the nation’s central bank, the Federal Reserve System. The system’s name comes from the fact that the Federal Reserve has the legal authority to make banks hold some of their deposits as reserves, which means the banks cannot lend out those deposits. These reserve funds are held in the Federal Reserve Bank. The Federal Reserve also acts as the banker for the federal government, but the government does not own the Federal Reserve. It is actually owned by the nation’s banks, which by law must join the Federal Reserve System and observe its regulations.

There are 12 regional Federal Reserve banks. These banks are not commercial banks. They do not accept savings deposits from or provide loans to individuals or businesses. Instead, the Federal Reserve functions as a central bank for other banks and for the federal government. In that role the Federal Reserve System performs several important functions in the national economy. First, the branches of the Federal Reserve distribute paper currency in their regions. Dollar bills are actually Federal Reserve notes. You can look at a dollar bill of any denomination and see the number for the regional Federal Reserve Bank where the bill was originally issued. But of course the dollar is a national currency, so a bill issued by any regional Federal Reserve Bank is good anyplace in the country. The distribution of currency occurs as commercial banks convert some of their reserve balances at the Federal Reserve System into currency, and then provide that currency to bank depositors who decide to hold some of their money balances as currency rather than deposits in checking accounts. The U.S. Treasury prints new currency for the Federal Reserve System. The bills are introduced into circulation when commercial banks use their reserves to buy currency from the Federal Reserve Bank.

Second, the regional Federal Reserve banks transfer funds for checks that are deposited by a bank in one part of the country, but were written by someone who has a checking account with a bank in another part of the country. Millions of checks are processed this way every business day. Third, the regional Federal Reserve Banks collect and analyze data on the economic performance of their regions, and provide that information and their analysis of it to the national Federal Reserve System. Each of the 12 regions served by the Federal Reserve banks has its own economic characteristics. Some of these regional economies are concerned more with agricultural issues than others; some with different types of manufacturing and industries; some with international trade; and some with financial markets and firms. After reviewing the reports from all different parts of the country, the national Federal Reserve System then adopts policies that have major effects on the entire U.S. economy.

By far the most important function of the Federal Reserve System is controlling the nation’s money supply and the overall availability of credit in the economy. If the Federal Reserve System wants to put more money in the economy, it does not ask the Treasury to print more dollar bills. Remember, much more money is held in checking and savings accounts than as currency, and it is through those deposit accounts that the Federal Reserve System most directly controls the money supply. The Federal Reserve affects deposit accounts in one of three ways.

First, it can allow banks to hold a smaller percentage of their deposits as reserves at the Federal Reserve System. A lower reserve requirement allows banks to make more loans and earn more money from the interest paid on those loans. Banks making more loans increase the money supply. Conversely, a higher reserve requirement reduces the amount of loans banks can make, which reduces or tightens the money supply.

The second way the Federal Reserve System can put more money into the economy is by lowering the rate it charges banks when they borrow money from the Federal Reserve System. This particular interest rate is known as the discount rate. When the discount rate goes down, it is more likely that banks will borrow money from the Federal Reserve System, to cover their reserve requirements and support more loans to borrowers. Once again, those loans will increase the nation’s money supply. Therefore, a decrease in the discount rate can increase the money supply, while an increase in the discount rate can decrease the money supply.

(WTO) and Its Predecessors

World Trade Organization (WTO) and Its Predecessors
As World War II drew to a close, leaders in the United States and other Western nations began working to promote freer trade for the post-war world. They set up the International Monetary Fund (IMF) in 1944 to stabilize exchange rates across member nations. The Marshall Plan, developed by U.S. general and economist George Marshall, promoted free trade. It gave U.S. aid to European nations rebuilding after the war, provided those nations reduced tariffs and other trade barriers.

In 1947 the United States and many of its allies signed the General Agreement on Tariffs and Trade (GATT), which was especially successful in reducing tariffs over the next five decades. In 1995 the member nations of the GATT founded the World Trade Organization (WTO), which set even greater obligations on member countries to follow the rules established under GATT. It also established procedures and organizations to deal with disputes among member nations about the trading policies adopted by individual nations.

In 1992 the United States also signed the North American Free Trade Agreement (NAFTA) with its closest neighbors and major trading partners, Canada and Mexico. The provisions of this agreement took effect in 1994. Since then, studies by economists have found that NAFTA has benefited all three nations, although greater competition has resulted in some factories closing. As a percentage of national income, the benefits from NAFTA have been greater in Canada and Mexico than in the United States, because international trade represents a larger part of those economies. While the United States is the largest trading nation in the world, it has a very large and prosperous domestic economy; therefore international trade is a much smaller percentage of the U.S. economy than it is in many countries with much smaller domestic economies.

Exchange Rates

Exchange Rates and the Balance of Payments
Currencies from different nations are traded in the foreign exchange market, where the price of the U.S. dollar, for instance, rises and falls against other currencies with changes in supply and demand. When firms in the United States want to buy goods and services made in France, or when U.S. tourists visit France, they have to trade dollars for French francs. That creates a demand for French francs and a supply of dollars in the foreign exchange market. When people or firms in France want to buy goods and services made in the United States they supply French francs to the foreign exchange market and create a demand for U.S. dollars.

Changes in people’s preferences for goods and services from other countries result in changes in the supply and demand for different national currencies. Other factors also affect the supply and demand for a national currency. These include the prices of goods and services in a country, the country’s national inflation rate, its interest rates, and its investment opportunities. If people in other countries want to make investments in the United States, they will demand more dollars. When the demand for dollars increases faster than the supply of dollars on the exchange markets, the price of the dollar will rise against other national currencies. The dollar will fall, or depreciate, against other currencies when the supply of dollars on the exchange market increases faster than the demand.

All international transactions made by U.S. citizens, firms, and the government are recorded in the U.S. annual balance of payments account. This account has two basic sections. The first is the current account, which records transactions involving the purchase (imports) and sale (exports) of goods and services, interest payments paid to and received from people and firms in other nations, and net transfers (gifts and aid) paid to other nations. The second section is the capital account, which records investments in the United States made by people and firms from other countries, and investments that U.S. citizens and firms make in other nations.

These two accounts must balance. When the United States runs a deficit on its current account, often because it imports more that it exports, that deficit must be offset by a surplus on its capital account. If foreign investments in the United States do not create a large enough surplus to cover the deficit on the current account, the U.S. government must transfer currency and other financial reserves to the governments of the countries that have the current account surplus. In recent decades, the United States has usually had annual deficits in its current account, with most of that deficit offset by a surplus of foreign investments in the U.S. economy.

Economists offer divergent views on the persistent surpluses in the U.S. capital account. Some analysts view these surpluses as evidence that the United States must borrow from foreigners to pay for importing more than it exports. Other analysts attribute the surpluses to a strong desire by foreigners to invest their funds in the U.S. economy. Both interpretations have some validity. But either way, it is clear that foreign investors have a claim on future production and income generated in the U.S. economy. Whether that situation is good or bad depends how the foreign funds are used. If they are used mainly to finance current consumption, they will prove detrimental to the long-term health of the U.S. economy. On the other hand, their effect will be positive if they are used primarily to fund investments that increase future levels of U.S. output and income.

CURRENT TRENDS AND ISSUES

In the early decades of the 21st century, many different social, economic and technological changes in the United States and around the world will affect the U.S. economy. The population of the United States will become older and more racially and ethnically diverse. The world population is expected to continue to grow at a rapid rate, while the U.S. population will likely grow much more slowly. World trade will almost certainly continue to expand rapidly if current trade policies and rates of economic growth are maintained, which in turn will make competition in the production of many goods and services increasingly global in scope. Technological progress is likely to continue at least at current rates, and perhaps faster. How will all of this affect U.S. consumers, businesses, and government?

Over the next century, average standards of living in the United States will almost certainly rise, so that on average, people living at the end of the century are likely to be better off in material terms than people are today. During the past century, the primary reasons for the increase in living standards in the United States were technological progress, business investments in capital goods, and people’s investments in greater education and training (which were often subsidized by government programs). There is no evident reason why these same factors will not continue to be the most important reasons underlying changes in the standard of living in the United States and other industrialized economies. A comparatively small number of economists and scientists from other fields argue that limited supplies of energy or of other natural resources will eventually slow or stop economic growth. Most, however, expect those limits to be offset by discoveries of new deposits or new types of resources, by other technological breakthroughs, and by greater substitution of other products for the increasingly scarce resources.

Although the U.S. economy will likely remain the world’s largest national economy for many decades, it is far less certain that U.S. households will continue to enjoy the highest average standard of living among industrialized nations. A number of other nations have rapidly caught up to U.S. levels of income and per capita output over the last five decades of the 20th century. They did this partly by adopting technologies and business practices that were first developed in the United States, or by developing their own technological and managerial innovations. But in large part, these nations have caught up with the United States because of their higher rates of savings and investment, and in some cases, because of their stronger systems for elementary and secondary education and for training of workers.

Most U.S. workers and families will still be better off as the U.S. economy grows, even if some other economies are growing faster and becoming somewhat more prosperous, as measured per capita. Certainly families in Britain today are far better off materially than they were 150 to 200 years ago, when Britain was the largest and wealthiest economy in the world, despite the fact that many other nations have since surpassed the British economy in size and affluence.

A more important problem for the U.S. economy in the next few decades is the unequal distribution of gains from growth in the economy. In recent decades, the wealth created by economic growth has not been as evenly distributed as was the wealth created in earlier periods. Incomes for highly educated and trained workers have risen faster than average, while incomes for workers with low levels of education and training have not increased and have even fallen for some groups of workers, after adjusting for inflation. Other industrialized market economies have also experienced rising disparity between high-income and low-income families, but wages of low-income workers have not actually fallen in real terms in those countries as they have in the United States.

In most industrialized nations, the demand for highly educated and trained workers has risen sharply in recent decades. That happened in part because many kinds of jobs now require higher skill levels, but other factors were also important. New production methods require workers to frequently and rapidly change what they do on the job. They also increase the need for quality products and customer service and the ability of employees to work in teams. Increased levels of competition, including competition from foreign producers, have put a higher premium on producing high quality products.

Several other factors help explain why the relative position of low-income workers has fallen more in the United States than in other industrialized Western nations. The growth of college graduates has slowed in the United States but not in other nations. United States immigration policies have not been as closely tied to job-market requirements as immigration policies in many other nations have been. Also, government assistance programs for low-income families are usually not as generous in the United States as they are in other industrialized nations.

Changes in the make-up of the U.S. population are likely to cause income disparity to grow, at least through the first half of the 21st century. The U.S. population is growing most rapidly among the groups that are most likely to have low incomes and experience some form of discrimination. Children in these groups are less likely to attend college or to receive other educational opportunities that might help them acquire higher-paying jobs.

The U.S. population will also be aging during this period. As people born during the baby boom of 1946 to 1964 reach retirement age, the percentage of the population that is retired will increase sharply, while the percentage that is working will fall. The demand for medical care and long-term care facilities will increase, and the number of people drawing Social Security benefits will rise sharply. That will increase pressure on government budgets. Eventually, taxes to pay for these services will have to be increased, or the level of these services provided by the government will have to be cut back. Neither of those approaches will be politically popular.