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MARGINAL COST AND DIMINISHING MARGINAL RETURNS: Decreasing then increasing marginal cost that gives rise to a U-shaped marginal cost curve reflects 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 production in the short run.

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MARKET STRUCTURE CONTINUUM

The four common market structures, perfect competition, monopoly, monopolistic competition, and oligopoly, can be viewed as a continuum based on (1) differences in the number of firms in a market, (2) the relative size of each firm, and thus (3) the market control of each firm. Perfect competition lies at one end and monopoly at the other. Monopolistic competition is close to perfect competition and oligopoly is near monopoly. The essence of the continuum is that monopolistic competition blends into oligopoly, with no clear-cut line of separation.

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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either a toaster oven that has convection cooking or a birthday gift for your mother. Be on the lookout for celebrities who speak directly to you through your television.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"Lead the life that will make you kindly and friendly to everyone about you, and you will be surprised what a happy life you will lead."

-- Charles M. Schwab

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