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TOTAL COST AND MARGINAL COST: A mathematical connection between marginal cost and total cost stating that marginal cost IS the slope of the total cost curve. If the total cost curve has a positive slope (that is, is upward sloping), then marginal cost is positive. Moreover, if the total cost curve has a positive and increasingly steeper slope, then the marginal cost is positive and rising. If the total cost curve has a positive and decreasingly steeper slope, then the marginal cost is positive but falling.

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PERFECT COMPETITION, PROFIT MAXIMIZATION

A perfectly competitive firm is presumed to produce the quantity of output that maximizes economic profit--the difference between total revenue and total cost. This production decision can be analyzed directly with economic profit, by identifying the greatest difference between total revenue and total cost, or by the equality between marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex seeking to buy either a small, foam rubber football or an instructional DVD on learning to the play the oboe. Be on the lookout for vindictive digital clocks with revenge on their minds.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
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