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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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POTENTIAL REAL GROSS DOMESTIC PRODUCT

The total real output (real gross domestic product) that the economy can produce if resources are fully employed. In theory this means that the economy is operating ON the production possibilities frontier. Full employment is generally indicated by achieving what is termed the natural unemployment rate. If the economy is at full employment then actual real gross domestic product is equal to potential real gross domestic product and the actual unemployment rate is equal to the natural unemployment rate. The macroeconomy is thus living up to its potential.

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