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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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OTHER PRICES, DEMAND DETERMINANT

The prices of other goods that influence the decision to purchase a particular good, which are assumed constant when a demand curve is constructed. Other prices can be for goods that are either substitutes-in-consumption or complements-in-consumption. This is one of five demand determinants that shift the demand curve when they change. The other four are other prices, buyers' preferences, buyers' expectations, and number of buyers.

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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
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