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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 PARTICIPATION RATE

The proportion of the total noninstitutionalized civilian population 16 years of age and over that is in the civilian labor force. The labor force participation rate is essentially the ratio of the civilian labor force to the total noninstitutionalized civilian population 16 years of age and over. The data used to estimated the labor force participation rate is obtained along with other labor force data from the monthly Current Population Survey conducted by the Bureau of the Census for the Bureau of Labor Statistics. Labor force participation rates are also commonly calculated using data derived from the Census of the Population.

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Today, you are likely to spend a great deal of time surfing the Internet trying to buy either a birthday greeting card for your aunt or a wall poster commemorating the moon landing. Be on the lookout for the happiest person in the room.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Ships are safe in harbor. But that is not what ships are for."

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