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BARRIER TO ENTRY: An institutional, government, technological, or economic restriction on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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LABOR FORCE

The total number of people in an economy, society, or country willing and able to exert mental and/or physical efforts in productive activities. The labor force is a more technical term for the labor resource or labor supply. It includes both employed workers and unemployed workers. An official variation of this term is civilian labor force. While labor force may or may not include military personnel, the civilian labor force explicitly excludes the military. Labor and labor resources are the theoretical terms that economists like to banter about. Labor force and civilian labor force are the terms of choice for government policy makers, data-crunchers, and others who need precise labor resource numbers.

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Today, you are likely to spend a great deal of time browsing about a thrift store trying to buy either a rechargeable flashlight or storage boxes for your computer software CDs. Be on the lookout for letters from the Internal Revenue Service.
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A half gallon milk jug holds about $50 in pennies.
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