Sunday, August 2, 2009

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HOW CARS ARE BUILT

Making a car involves several major decisions about the design of the car, how it will be built, and how it will be sold. Managers must also coordinate factory production, purchase materials, and train workers—all within a budget. Marketing teams must then sell the car and project returns on shareholder investments. New models are introduced yearly, but a single car design can take several years to get from the drawing board to the showroom floor. A typical company will therefore have several new designs in various stages of development at any given time.

The group within an automobile company that makes the main decisions about new cars often includes the chairman of the board and board members, the president, the marketing director, the sales director, the finance director, and the head of product development. These leaders must budget money, recruit a workforce, and set realistic deadlines. Rather than sending ideas from step to step as they are completed, leaders collaborate from the start with designers and engineers in a process known as simultaneous engineering to increase the speed and efficiency of car production. Engineering, manufacturing, sales, and other specialized departments in turn support the leadership decisions. Most of these positions require college degrees and extensive training. Companies also rely on the administrative services of clerks, typists, telephone operators, and others to support the process of automaking.

Research, Design, and Development:
Before a new car is built, it must be researched, designed, and developed into a workable product. Researchers analyze market trends, consumer surveys, and buying patterns to determine what consumers want, and then suggest what kinds of cars to make. Designers work to shape these new ideas into tangible parts or products. Engineers adapt existing parts for the new model and draw up new plans for the prototype. A prototype is a custom-built working example of a new design. Manufacturers begin by building a few prototypes before they set up a factory to build the new car. Product planners monitor the process along the way and make sure that an approved new car program finishes on time and within budget.

As technology advances, new cars continually feature new systems and innovations. Change and innovation in the auto industry take time to implement and must allow for, but not be overwhelmed by, consumer whims or government regulations. New systems are usually introduced one at a time, or new technologies applied to one area at a time. A new component system (such as a new braking system) in a fully developed prototype can take as long as four years to incorporate into a new model. Part of this time is needed to design, build, and install production tools to make the new model. Testing the new system on rough mock-ups (called test beds) and in preproduction vehicles to see what happens to overall performance takes additional time.

Meanwhile, members of the marketing and sales staffs select a name for the new product, conduct surveys to determine what share of the market the new model can anticipate, and troubleshoot potential problems. Initial production targets are set according to available market research results.

Once the board approves the model and name, the first working prototype emerges from experimental workshops. Board members try out the working prototype, then experts take it through extensive tests, including wind tunnel, dust tunnel, factory track, water-proofing bays, desert heat, arctic cold, and crash tests.

Manufacturing and Assembly:
Before a new model can be built, the factory must first be retooled. Retooling a factory involves changing the machines on the factory floor to produce a different style of automobile. Skilled tool makers, pattern makers, and die makers look at the specifications for the new car parts and cooperate with the tool design office to craft the tools and modify, or tool up, the machines.

The purchasing department assures that needed supplies for production are available on time and within budget. Qualified buyers have knowledge of both engineering and accounting, and they are responsible for ordering the raw materials to make the parts in-house or for ordering finished components from a parts supplier.

After raw materials are received and inspected, they are cast, forged, stamped, or molded into different body shapes. Press shop workers operate the machines that stamp steel into body panels. Fiberglass molders and cutters help mold large plastic body parts and cut the rough edges. Paint shop workers and spray gun operators put the final touches on the plastic or steel shell. Since many of these body-making jobs have been or are being automated, there is an increasing need for computer analysts, programmers, and technicians. These computer-oriented positions usually require college degrees or post-high-school training.
Machine operators, who work in all parts of the factory, are particularly important in engine building. They take the rough castings and forgings of the engine parts and machine them to the required tolerances and accuracy. Machine operators need to be skilled, with experience on numerically controlled and computerized machinery. Engine builders put the engine parts together by hand, a job for car mechanics who can quickly understand changes in engine design.

Manufacturing personnel work on the assembly lines and operate numerous machines, computers, robots, and other equipment to produce the items needed for each car. Heat treatment tempers and strengthens the forged and cast parts, which are then shaped into components that are assembled into subassemblies (gearboxes, axles, engines, doors, dashboards). The chassis (the underlying frame of the automobile) and body are joined and painted. Electricians, many of whom are first hired as apprentices or trained in company training programs, make sure that electrical parts are correctly fitted and connected in the car.

Components and subassemblies are gradually combined along the assembly line at different points to construct the car. Line operators generally are less skilled workers who carry out one or two simple assembly line operations. The manufacturer gives these workers limited training. At almost every stage of the assembly process, skilled inspectors assure the quality of the work.

This pattern of production, which emerged from 1900 to 1920, changed little in the first 80 years of the century. Beginning in the late 1970s and early 1980s, manufacturers began buying completed subassemblies instead of their components—completed dashboards, for instance, rather than individual instruments—and began building the auto body around these subassemblies. These and other production strategies have enabled companies to address the fast-changing market more rapidly and effectively. Companies can now change production lines faster and make more specialized cars more economically.

Sales and Service:
Market researchers contribute to the original design process and continue their studies throughout the manufacture and sale of a car. Market researchers compile newspaper, industry, and public reaction from polls and product surveys. They use these findings to help plan sales campaigns. For example, if surveys show consumers like the energy-saving features of a car, then those features might be the focus of advertising. The advertising department uses results from polls and focus groups (small groups of potential consumers) to shape advertising tools for dealers as well as national advertising campaigns aimed directly at the public.

The corporate sales staff works with the car dealers throughout the country to prepare them to sell the new product. Toward the end of the 20th century, the number of dealerships declined, but their size and the number of total cars sold increased. In 1950 about 47,000 dealers sold 7.2 million vehicles. By 1985 half as many dealers sold twice as many cars. High-volume dealers, called megadealers, with multiple locations and multiple franchises (agreements with several companies to sell their cars) compete most favorably. Car supermarkets (establishments that sell used cars at a fixed price, often with a 30-day return policy) and dealerships with separate repair and sales departments are two current trends that are likely to continue. Many car dealerships in the United States also devote a portion of their sales staff to Internet sales. Internet sales associates help potential buyers research and purchase cars online.

Dealership mechanics must learn how to maintain and repair new models. More than 80 percent of the functions of the average automobile are controlled by electronics. This has created a large need for educated mechanics who can also operate computerized diagnostic equipment. The National Institute for Automotive Service Excellence (ASE) was established in 1972 to help consumers select competent service professionals. ASE Certification of mechanics increased from 8,567 in 1972 to more than 400,000 in 2002. Trade and technical schools continue to be the major source of training for service professionals, who work in car dealerships, service stations, tire shops, and elsewhere.

Customer Feedback:
Consumers have increasingly become part of the team that shapes the products that are designed and built—especially since the 1960s and 1970s. The company maintains a press fleet so automotive correspondents can test drive new models and review them. In some companies, top executives also test drive new cars and give their feedback. Focus groups of consumers are organized to test recent innovations to see if they would be suitable to apply across a product line. For example, focus groups of consumers who like off-road operation provided the initial market test of four-wheel drive passenger cars. Other consumer groups have road tested innovations such as fuel injection, turbocharging, and trip computers. After these focus groups give their feedback, designers refine the innovations and introduce them into other vehicles.

CORPORATIONS AND OTHER TYPES OF BUSINESSES

Three major types of firms carry out the production of goods and services in the U.S. economy: sole proprietorships, partnerships, and corporations. In 1995 the U.S. economy included 16.4 million proprietorships, excluding farms; 1.6 million partnerships; and about 4.3 million corporations. The corporations, however, produce far more goods and services than the proprietorships and partnerships combined.

Proprietorships and Partnerships
Sole proprietorships are typically owned and operated by one person or family. The owner is personally responsible for all debts incurred by the business, but the owner gets to keep any profits the firm earns, after paying taxes. The owner’s liability or responsibility for paying debts incurred by the business is considered unlimited. That is, any individual or organization that is owed money by the business can claim all of the business owner’s assets (such as personal savings and belongings), except those protected under bankruptcy laws.

Normally when the person who owns or operates a proprietorship retires or dies, the business is either sold to someone else, or simply closes down after any creditors are paid. Many small retail businesses are operated as sole proprietorships, often by people who also work part-time or even full-time in other jobs. Some farms are operated as sole proprietorships, though today corporations own many of the nation’s farms.

Partnerships are like sole proprietorships except that there are two or more owners who have agreed to divide, in some proportion, the risks taken and the profits earned by the firm. Legally, the partners still face unlimited liability and may have their personal property and savings claimed to pay off the business’s debts. There are fewer partnerships than corporations or sole proprietorships in the United States, but historically partnerships were widely used by certain professionals, such as lawyers, architects, doctors, and dentists. During the 1980s and 1990s, however, the number of partnerships in the U.S. economy has grown far more slowly than the number of sole proprietorships and corporations. Even many of the professions that once operated predominantly as partnerships have found it important to take advantage of the special features of corporations.

Corporations
In the United States a corporation is chartered by one of the 50 states as a legal body. That means it is, in law, a separate entity from its owners, who own shares of stock in the corporation. In the United States, corporate names often end with the abbreviation Inc., which stands for incorporated and refers to the idea that the business is a separate legal body.

Limited Liability
The key feature of corporations is limited liability. Unlike proprietorships and partnerships, the owners of a corporation are not personally responsible for any debts of the business. The only thing stockholders risk by investing in a corporation is what they have paid for their ownership shares, or stocks. Those who are owed money by the corporation cannot claim stockholders’ savings and other personal assets, even if the corporation goes into bankruptcy. Instead, the corporation is a separate legal entity, with the right to enter into contracts, to sue or be sued, and to continue to operate as long as it is profitable, which could be hundreds of years.

When the stockholders who own the corporation die, their stock is part of their estate and will be inherited by new owners. The corporation can go on doing business and usually will, unless the corporation is a small, closely held firm that is operated by one or two major stockholders. The largest U.S. corporations often have millions of stockholders, with no one person owning as much as 1 percent of the business. Limited liability and the possibility of operating for hundreds of years make corporations an attractive business structure, especially for large-scale operations where millions or even billions of dollars may be at risk.

When a new corporation is formed, a legal document called a prospectus is prepared to describe what the business will do, as well as who the directors of the corporation and its major investors will be. Those who buy this initial stock offering become the first owners of the corporation, and their investments provide the funds that allow the corporation to begin doing business.

IMPACT OF THE WORLD ECONOMY

Today, virtually every country in the world is affected by what happens in other countries. Some of these effects are a result of political events, such as the overthrow of one government in favor of another. But a great deal of the interdependence among the nations is economic in nature, based on the production and trading of goods and services.

One of the most rapidly growing and changing sectors of the U.S. economy involves trade with other nations. In recent decades, the level of goods and services imported from other countries by U.S. consumers, businesses, and government agencies has increased dramatically. But so, too, has the level of U.S. goods and services sold as exports to consumers, businesses, and government agencies in other nations. This international trade and the policies that encourage or restrict the growth of imports and exports have wide-ranging effects on the U.S. economy.

As the nation with the world’s largest economy, the United States plays a key role on the international political and economic stages. The United States is also the largest trading nation in the world, exporting and importing more goods and services than any other country.
Some people worry that extensive levels of international trade may have hurt the U.S. economy, and U.S. workers in particular. But while some firms and workers have been hurt by international competition, in general economists view international trade like any other kind of voluntary trade: Both parties can gain, and usually do. International trade increases the total level of production and consumption in the world, lowers the costs of production and prices that consumers pay, and increases standards of living. How does that happen?

All over the world, people specialize in producing particular goods and services, then trade with others to get all of the other goods and services they can afford to buy and consume. It is far more efficient for some people to be lawyers and other people doctors, butchers, bakers, and teachers than it is for each person to try to make or do all of the things he or she consumes.

In earlier centuries, the majority of trade took place between individuals living in the same town or city. Later, as transportation and communications networks improved, individuals began to trade more frequently with people in other places. The industrial revolution that began in the 18th century greatly increased the volume of goods that could be shipped to other cities and regions, and eventually to other nations. As people became more prosperous, they also traveled more to other countries and began to demand the new products they encountered during their travels.

The basic motivation and benefits of international trade are actually no different from those that lead to trade within a nation. But international trade differs from trade within a nation in two major ways. First, international trade involves at least two national currencies, which must usually be exchanged before goods and services can be imported or exported. Second, nations sometimes impose barriers on international trade that they do not impose on trade that occurs entirely inside their own country.

Friday, June 12, 2009

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.