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VARIABLE INPUT: An input whose quantity can be changed in the time period under consideration. This should be immediately compared and contrasted with fixed input. The most common example of a variable input is labor. A variable input provides the extra inputs that a firm needs to expand short-run production. In contrast, 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. This is, by the way, the law of diminishing marginal returns.

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LONG-RUN PRODUCTION ANALYSIS

An analysis of the production decision made by a firm in the long run. The central characteristic of long-run production analysis is that all inputs under the control of the firm are variable. The central principle guiding production in the long run is returns to scale, which indicates how production responds to proportional changes in all inputs. A contrasting analysis is short-run production analysis.

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