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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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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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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time going from convenience store to convenience store trying to buy either a bottle of blackcherry flavored spring water or a travel case for you toothbrush. Be on the lookout for neighborhood pets, especially belligerent parrots.
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This isn't me! What am I?

A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
"Believe one who has tried it. "

-- Virgil, Roman poet

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