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MARGINAL COST: The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost indicates how much total cost changes for a give change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (remember total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. Marginal cost, usually abbreviated MC, is found by dividing the change in total cost (or total variable cost) by the change in output.

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SUBSTITUTE-IN-PRODUCTION

One of two (or more) goods that use the same resource for production in an exclusionary manner. A substitute-in-production is one of two alternatives falling within the other prices determinant of supply. The other is a complement-in-production. An increase in the price of one substitute good causes a decrease in supply for the other.

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