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TOTAL VARIABLE COST CURVE: A curve that graphically represents the relation between total variable cost incurred by a firm in the short-run production of a good or service and the quantity produced. The marginal cost curve, THE focal point for the analysis of short-run production, can be derived directly from the total variable cost curve. The shape of the total variable cost curve reflects increasing marginal returns at small quantities of output and decreasing marginal returns at later quantities.

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VARIABLE INPUT

An input whose quantity can be changed in the time period under consideration. The most common example of a variable input is labor. Variable inputs provide the means used by a firm to control short-run production. The alternative to variable input is fixed input. A fixed input, like capital, provides the capacity constraint in production. As larger quantities of a variable input, like labor, are added to a fixed input like capital, the variable input becomes less productive, which is the law of diminishing marginal returns.

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