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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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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 searching for rummage sales wanting to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for celebrities who speak directly to you through your television.
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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
"Nothing will ever be attempted if all possible objections must first be overcome. "

-- Samuel Johnson, essayist, critic, lexicographer

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