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MARGINAL REVENUE CURVE, PERFECT COMPETITION: A curve that graphically represents the relation between the marginal revenue received by a perfectly competitive firm for selling its output and the quantity of output sold. Because a perfectly competitive firm is a price taker and faces a horizontal demand curve, its marginal revenue curve is also horizontal and coincides with its average revenue (and demand) curve. A perfectly competitive firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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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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Today, you are likely to spend a great deal of time strolling through a department store trying to buy either a New York Yankees baseball cap or a solid oak entertainment center. Be on the lookout for telephone calls from long-lost relatives.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
"Every time you win, it diminishes the fear a little bit. You never really cancel the fear of losing; you keep challenging it. "

-- Arthur Ashe, tennis player

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