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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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RECESSIONARY GAP

The difference between the equilibrium real production achieved in the short-run aggregate market and full-employment real production that occurs when short-run equilibrium real production is less than full-employment real production. A recessionary gap, also termed a contractionary gap, is associated with a business-cycle contraction. This is one of two alternative output gaps that can occur when short-run equilibrium generates production that differs from full employment. The other is an inflationary gap.

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Today, you are likely to spend a great deal of time at a garage sale trying to buy either a coffee cup commemorating the 2000 Olympics or a birthday gift for your grandmother. Be on the lookout for strangers with large satchels of used undergarments.
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Lombard Street is London's equivalent of New York's Wall Street.
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