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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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U-SHAPED COST CURVES

The family of short-run cost curves consisting of average total cost, average variable cost, and marginal cost, all of which have U-shapes. Each is U-shaped because it begins with relatively high but falling cost for small quantities of output, reaches a minimum value, then has rising cost at large quantities of output. Although the average fixed cost curve is not U-shaped, it is occasionally included with the other three just for sake of completeness.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time driving to a factory outlet seeking to buy either decorative picture frames or storage boxes for your income tax returns. Be on the lookout for telephone calls from long-lost relatives.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"It is not fair to ask of others what you are unwilling to do yourself. "

-- Eleanor Roosevelt, diplomat, activist

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