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PERFECT COMPETITION: An ideal market structure characterized by a large number of small firms, identical products sold by all firms, freedom of entry into and exit out of the industry, and perfect knowledge of prices and technology. This is one of four basic market structures. The other three are monopoly, oligopoly, and monopolistic competition. Perfect competition is an idealized market structure that's not observed in the real world. While unrealistic, it does provide an excellent benchmark that can be used to analyze real world market structures. In particular, perfect competition efficiently allocates resources.

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DOUBLE COINCIDENCE OF WANTS

The requirements of a barter exchange that each trader has want the other wants and wants what the other has. Because everyone does not necessarily want everything, the lack of double coincidence of wants is a major obstacle in barter exchanges, especially for complex, modern economies like that fond in the United States. While double coincidence of wants is also essential for exchanges involving money, it is such an inherent trait of money that it is not a problem. By its very nature as a generally accepted medium of exchange, everyone WANTS money.

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Today, you are likely to spend a great deal of time strolling through a department store trying to buy either a New York Yankees baseball cap or a solid oak entertainment center. Be on the lookout for telephone calls from long-lost relatives.
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The word "fiscal" is derived from a Latin word meaning "moneybag."
"Every time you win, it diminishes the fear a little bit. You never really cancel the fear of losing; you keep challenging it. "

-- Arthur Ashe, tennis player

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