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FIXED FACTOR OF PRODUCTION: An input whose quantity cannot be changed in the time period under consideration. This usually goes by the shorter term fixed input and should be immediately compared and contrasted with variable factor of production, which goes by the shorter term variable input. The most common example of a fixed factor of production is capital. A fixed factor of production provides the "capacity" constraint for the short-run production of a firm. As larger quantities of a variable factor of production, like labor, are added to a fixed factor of production like capital, the variable input becomes less productive. This is, by the way, the law of diminishing marginal returns. For more detailed discussion, take a look at the shorter, more commonly used alias of fixed factor of production, which is fixed input.

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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 (MC) indicates how much total cost changes for a given change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. It is found by dividing the change in total cost (or total variable cost) by the change in output. Marginal cost is one of four cost concepts used in short-run production analysis. The other three are average total cost, average fixed cost, and average variable cost.

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