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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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IMPERFECT COMPETITION Markets or industries with two or more sellers and buyers that fail to match the criteria of perfect competition. The most noted examples of imperfect competition are the two market structures with selling-side control--monopolistic competition and oligopoly. Lesser known market structures with buying-side control--monopsonistic competition and oligopsony--are also considered as imperfect competition. Facing no competition, monopoly and monopsony are not included. Most real world markets can be considered imperfect competition.
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GRAY SKITTERY
[What's This?]
Today, you are likely to spend a great deal of time lost in your local discount super center seeking to buy either a green fountain pen or a handcrafted bird house. Be on the lookout for telephone calls from former employers.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
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"Do not let what you cannot do interfere with what you can do. " -- John Wooden, basketball coach
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IRT
International Trade Commission
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