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TOTAL FIXED COST: Cost of production that does NOT change with changes in the quantity of output produced by a firm in the short run. Total fixed cost is one part of total cost. The other is total variable cost. At any and all levels of output, fixed cost is the same. It doesn't change. This includes cost that is not dependent on, or unrelated to, production. The best way to identify fixed cost is to produce zero output. Fixed cost is incurred whether or not any output is produced. A cost measure directly related to total fixed cost is average fixed cost.

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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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