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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions 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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EFFICIENT

The state of resource allocation that exists when the highest level of consumer satisfaction is achieved from available resources. This state can be accomplished through markets when the price buyers are willing and able to pay for a good--based on the satisfaction obtained--is equal to the price sellers need to charge for a good--based on the opportunity cost of production.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex seeking to buy either a small, foam rubber football or an instructional DVD on learning to the play the oboe. Be on the lookout for vindictive digital clocks with revenge on their minds.
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Potato chips were invented in 1853 by a irritated chef repeatedly seeking to appease the hard to please Cornelius Vanderbilt who demanded french fried potatoes that were thinner and crisper than normal.
"Courage is the ladder on which all the other virtues mount."

-- Claire Boothe Luce, diplomat, writer

NAIRU
Non-Accelerating Inflation Rate of Unemployment
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