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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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COMMON-PROPERTY GOODS

Goods characterized by rival consumption and the inability to exclude nonpayers. Common-property goods are one of four types of goods differentiated by consumption rivalry and nonpayer excludability. The other three goods are private (rival consumption and nonpayers can be excluded), public (nonrival consumption and nonpayers cannot be excluded), and near-public (nonrival consumption and nonpayers can be excluded). Nonrival consumption and the ease of excluding of nonpayers means common-property goods cannot be efficiently exchanged through markets and are often overconsumed.

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Today, you are likely to spend a great deal of time driving to a factory outlet seeking to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for neighborhood pets, especially belligerent parrots.
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
"If anything terrifies me, I must try to conquer it. "

-- Francis Charles Chichester, yachtsman, aviator

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