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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.
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OLIGOPOLY AND MONOPOLY Oligopoly and monopoly have some similarities, both tend to be relatively large and possess significant market control, but also have a few important differences, oligopoly market has more than one firm. The dividing line between oligopoly and monopoly, however, can be blurred due to the closeness of substitutes and the inclination of oligopoly firms to collude.
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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.
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"If anything terrifies me, I must try to conquer it. " -- Francis Charles Chichester, yachtsman, aviator
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Income, Nominal Gross National Product
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