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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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EXCHANGE

The process of trading one valuable commodity (good, service, or resource) for another. An exchange can be voluntary, such as what transpires through a market, or involuntary, such as when taxes are imposed by government.

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Today, you are likely to spend a great deal of time visiting every yard sale in a 30-mile radius hoping to buy either a large, stuffed giraffe or a birthday greeting card for your aunt. Be on the lookout for telephone calls from long-lost relatives.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
"The past cannot be changed. The future is yet in your power. "

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