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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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FACTOR SUPPLY DETERMINANTS

Ceteris paribus influences, other than factor price, that shift the factor supply fall into three general categories: (1) market supply determinants, (2) market demand determinants, and (3) mobility. Comparable to any determinant, those falling into these three categories cause the factor supply curve to shift to a new location. An increase in factor supply is a rightward shift of the factor supply curve and a decrease in factor supply is a leftward shift.

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