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ENTRY BARRIER: 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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OLIGOPOLY, CHARACTERISTICS The three most important characteristics of oligopoly are: (1) an industry dominated by a small number of large firms, (2) firms sell either identical or differentiated products, and (3) the industry has significant barriers to entry.
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BLUE PLACIDOLA
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Today, you are likely to spend a great deal of time at a crowded estate auction wanting to buy either a pair of red and purple designer socks or a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for poorly written technical manuals.
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This isn't me! What am I?
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A communal society, a prime component of Karl Marx's communist philosophy, was advocated by the Greek philosophy Plato.
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"If a man hasn't discovered something that he will die for, he isn't fit to live. " -- Martin Luther King Jr., clergyman
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GARP
Generalized Axioms of Revealed Preference
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