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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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MARKET CLEARING

A condition of the market in which the quantity demanded is equal to the quantity supplied, such that the market is "clear" of any shortage or surplus. Market clearing is a common, non-technical term for equilibrium. In a market graph, the market clearing is found at the intersection of the demand curve and the supply curve.

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APLS

BROWN PRAGMATOX
[What's This?]

Today, you are likely to spend a great deal of time looking for a downtown retail store trying to buy either a wall poster commemorating the first day of winter or blue cotton balls. Be on the lookout for celebrities who speak directly to you through your television.
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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
"One person with a belief is equal to a force of ninety-nine with only interests."

-- John Stuart Mill

MPC
Marginal Propensity to Consume
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