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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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CARDINAL UTILITY

The notion that utility--the satisfaction of wants and needs achieved through the consumption of goods and services--can be measured with numerical values (1, 2, 3, etc.) that are based on a benchmark scale. Cardinal utility presumes that satisfaction is a measurable characteristic of a person, like height or weight. The contrasting notion is ordinal utility, which is based on a ranking of preferences.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs looking to buy either a T-shirt commemorating the 2000 Presidential election or a really, really exciting, action-filled video game. Be on the lookout for the last item on a shelf.
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North Carolina supplied all the domestic gold coined for currency by the U.S. Mint in Philadelphia until 1828.
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