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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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ELASTICITY DETERMINANTS

Three factors that affect the numerical value of the price elasticity of demand and the price elasticity of supply--availability of substitutes, time period of analysis, and proportion of budget. The price elasticities of demand and/or supply for a good can change if these determinants change. The first two determinants are important to both price elasticity of demand and price elasticity of supply, while the third relates specifically to the price elasticity of demand.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors seeking to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for telephone calls from long-lost relatives.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
"Failure is a part of success. There is no such thing as a bed of roses all your life. But failure will never stand in the way of success if you learn from it. "

-- Hank Aaron, baseball player

JEH
Journal of Economic History
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