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ENTRY BARRIER: 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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UNEMPLOYMENT RATE, MEASUREMENT PROBLEMS

The official unemployment rate, which measures the proportion of the civilian labor force 16 years or older that is not engaged in productive activities but is actively seeking employment, might be either overstated or understated due to discouraged workers, part-time workers, and unreported legal or illegal employment. Taken together, these measurement problems suggest that the official unemployment rate is likely understated during business-cycle contraction and overstated during business-cycle expansions.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a coffee table shaped like the state of Florida or storage boxes for your summer clothes. Be on the lookout for deranged pelicans.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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