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MARGINAL REVENUE CURVE, PERFECT COMPETITION: A curve that graphically represents the relation between the marginal revenue received by a perfectly competitive firm for selling its output and the quantity of output sold. Because a perfectly competitive firm is a price taker and faces a horizontal demand curve, its marginal revenue curve is also horizontal and coincides with its average revenue (and demand) curve. A perfectly competitive firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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FIXED COST: In general, cost that does not change with changes in the quantity of output produced. More specifically, fixed cost is combined with the adjectives "total" and "average" to indicate the overall level of fixed cost or the per unit fixed cost. Fixed cost is incurred whether of not any output is produced. The same fixed cost is incurred at any and all output levels. This means that total fixed cost is, in fact, FIXED. However, it also means that average fixed cost, or fixed cost per unit, declines as the output level increases. Spreading out $100 over 1,000 units gives a lower per unit fixed cost that spreading out $100 over 10 units.

     See also | opportunity cost | total cost | total fixed cost | average fixed cost | variable cost | fixed input | variable input | short-run production |


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FIXED COST, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 6, 2025].


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ASSUMPTIONS, PRODUCTION POSSIBILITIES

The four key assumptions underlying production possibilities analysis are: (1) resources are used to produce one or both of only two goods, (2) the quantities of the resources do not change, (3) technology and production techniques do not change, and (4) resources are used in a technically efficient way.

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