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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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INCREASING MARGINAL RETURNS

In the short-run production by a firm, an increase in the variable input results in an increase in the marginal product of the variable input. Increasing marginal returns typically surface when the first few quantities of a variable input are added to a fixed input. This is one of two alternatives for marginal returns. The other is decreasing marginal returns. A related phenomenon for long-run production is increasing returns to scale.

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Today, you are likely to spend a great deal of time driving to a factory outlet wanting to buy either a T-shirt commemorating yesterday or a pair of handcrafted oven mitts. Be on the lookout for crowded shopping malls.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"Even a mistake may turn out to be the one thing necessary to a worthwhile achievement."

-- Henry Ford

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