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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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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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Today, you are likely to spend a great deal of time flipping through the yellow pages trying to buy either a rechargeable battery for your camera or a coffee cup commemorating the first day of spring. Be on the lookout for infected paper cuts.
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Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
"If you wouldn't write it and sign it, don't say it."

-- Earl Wilson, Columnist

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