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REALISM OF PERFECT COMPETITION: Perfect competition is an idealized market structure that does NOT exist in the real world. While some real world industries might come relatively close to a one or two of the four key characteristics of perfect competition, none matches all four sufficiently that we can declare a perfectly competitively industry. Some industries come close on the large number of small firms and the identical product characteristics. A few industries have relatively good, although not perfect, information about prices and technology. However, almost all industries fall far short of the perfect mobility characteristics.
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MARGINAL COST AND LAW OF DIMINISHING MARGINAL RETURNS Decreasing then increasing marginal cost, reflected by a U-shaped marginal cost curve, is the result of increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of short-run production. This translates into a positively-sloped supply curve for profit-maximizing competitive firms.
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WHITE GULLIBON
[What's This?]
Today, you are likely to spend a great deal of time at a flea market seeking to buy either a set of steel-belted radial snow tires or a wall poster commemorating the 2000 Presidential election. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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This isn't me! What am I?
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Two and a half gallons of oil are needed to produce one automobile tire.
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"Don't be afraid of the space between your dreams and reality. If you can dream it, you can make it so." -- Belva Davis, Journalist
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IDA
International Development Association
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