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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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LAW OF SUPPLY

The direct relationship between supply price and the quantity supplied, assuming ceteris paribus factors are held constant. This economic principle indicates that an increase in the price of a commodity results in an increase in the quantity of the commodity that sellers are willing and able to sell in a given period of time, if other factors are held constant. The law of supply is an important principle in the study of economics.

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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
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