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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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PRIVATE GOODS Goods characterized by rival consumption and the ability to exclude nonpayers. Private goods are one of four types of goods differentiated by consumption rivalry and nonpayer excludability. The other three goods are public (nonrival consumption and nonpayers cannot be excluded), common-property (rival consumption and nonpayers cannot be excluded), and near-public (nonrival consumption and nonpayers can be excluded). Rival consumption and the ease of excluding of nonpayers means private goods can be efficiently exchanged through markets.
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RED AGGRESSERINE
[What's This?]
Today, you are likely to spend a great deal of time at a flea market hoping to buy either a birthday greeting card for your father or a T-shirt commemorating the first day of spring. Be on the lookout for defective microphones.
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This isn't me! What am I?
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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.
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"Defeat is simply a signal to press onward. " -- Helen Keller, author, lecturer
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GARP
Generalized Axioms of Revealed Preference
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