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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

A condition in which a given good or resource is limited relative to its desired uses. This is a special condition of the general condition of scarcity. A scarce good or resource is typically exchanged through markets and carries a positive price.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex seeking to buy either a how-to book on wine tasting or a bookshelf that will fit in your closet. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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A half gallon milk jug holds about $50 in pennies.
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