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MARKET STRUCTURE: The manner in which a market is organized, based largely on the number of firms in the industry. The four basic market structure models are: perfect competition, monopoly, monopolistic competition, and oligopoly. The primary difference between each is the number of firms on the supply side of a market. Both perfect competition and monopolistic competition have a large number of relatively small firms selling output. Oligopoly has a small number of relatively large firms. And monopoly has a single firm.

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INFORMATION SEARCH

The decision to seek out or produce information based on a comparison of the cost of acquiring the information and the benefit obtained from the information. Efficient information search is achieved with a equality between the marginal cost of search and the marginal benefit of search. Because the marginal cost of search is invariably greater than zero, search effort stops short of acquiring complete information.

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Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either a handcrafted bird feeder or a New York Yankees baseball cap. Be on the lookout for letters from the Internal Revenue Service.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"The human race has only one really effective weapon and that is laughter."

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