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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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TOTAL-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding total value stating that the marginal IS the slope of the total curve. This mathematical relation between total and marginal surfaces throughout the study of economics, especially utility (total utility and marginal utility), production (total product and marginal product), cost (total cost and marginal cost), and revenue (total revenue and marginal revenue). A related mathematical relation exists between a marginal value and the corresponding average value.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time searching the newspaper want ads trying to buy either a set of tires or a birthday gift for your grandfather. Be on the lookout for celebrities who speak directly to you through your television.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"Education is the ability to listen to almost anything without losing your temper or your self-confidence. "

-- Robert Frost

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Real Business Cycle
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