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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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CONSTANT RETURNS TO SCALE

A given proportional change in all resources in the long run results in the same proportional change in production. Constant returns to scale exists if a firm increases ALL resources--labor, capital, and other inputs--by 10 percent, and output also increases by 10 percent. This is one of three returns to scale. The other two are increasing returns to scale and decreasing returns to scale.

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Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either a coffee cup commemorating the first day of spring or a printer that works with your stockpile of ink cartridges. Be on the lookout for neighborhood pets, especially belligerent parrots.
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Lombard Street is London's equivalent of New York's Wall Street.
"No man, for any considerable time, can wear one face to himself and another to the multitude without finally getting bewildered as to which may be true."

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