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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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SCARCE RESOURCES

Labor, capital, land, and entrepreneurship used by society to produce consumer satisfying goods and services. Scarce resources, also termed just resources, are often given the more descriptive term factors of production.

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Today, you are likely to spend a great deal of time at a flea market trying to buy either a pleather CD case or a how-to book on fine dining. Be on the lookout for telephone calls from long-lost relatives.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"How wonderful it is that nobody need wait a single moment before starting to improve the world. "

-- Anne Frank, diarist

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