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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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SUBSTITUTE-IN-CONSUMPTION

One of two (or more) goods that provide the same basic satisfaction of a want or need when consumed. A substitute-in-consumption is one of two alternatives falling within the other prices determinant of demand. The other is a complement-in-consumption. An increase in the price of one substitute good causes an increase in demand for the other. A substitute-in-consumption has a positive cross elasticity of demand.

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Today, you are likely to spend a great deal of time wandering around the downtown area looking to buy either a rechargeable battery for your computer or shoe laces for your snow boots. Be on the lookout for high interest rates.
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The standard "debt" notation I.O.U. does not mean "I owe you," but actually stands for "I owe unto..."
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