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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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LABOR

The mental and physical human efforts used in the production of goods and services. This is one of four basic categories of resources, or factors of production. The other three are capital, land, and entrepreneurship.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store wanting to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for crowded shopping malls.
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Two and a half gallons of oil are needed to produce one automobile tire.
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