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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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MARKET CLEARING

A condition of the market in which the quantity demanded is equal to the quantity supplied, such that the market is "clear" of any shortage or surplus. Market clearing is a common, non-technical term for equilibrium. In a market graph, the market clearing is found at the intersection of the demand curve and the supply curve.

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Today, you are likely to spend a great deal of time watching infomercials trying to buy either a replacement battery for your pocket calculator or a how-to book on home remodeling. Be on the lookout for mail order catalogs with hidden messages.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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