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TOTAL VARIABLE COST AND MARGINAL COST: A mathematical connection between marginal cost and total variable cost stating that marginal cost IS the slope of the total variable cost curve. This relation between total variable cost and marginal cost is also seen with total cost. The slope of the total cost curve is marginal cost, as well. The relation between total variable cost and marginal cost is but another in the long line of applications of the total-marginal relation.

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MARGINAL REVENUE, PERFECT COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a perfectly competitive firm equates marginal revenue and marginal cost.

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