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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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VARIABLES

Quantities, usually represented as symbols, that can take on one of a set of values. A variable is "variable" because its value can "vary." A primary goal of economic analysis is to determine the specific value that a variable takes on under specific circumstances.

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Today, you are likely to spend a great deal of time flipping through the yellow pages seeking to buy either a hepa filter for your furnace or a wall poster commemorating next Thursday. Be on the lookout for pencil sharpeners with an attitude.
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In the early 1900s around 300 automobile companies operated in the United States.
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