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COMPLEMENT-IN-CONSUMPTION: One of two goods that are consumed together to provide satisfaction -- that is, the goods are used jointly to satisfy wants and needs. A complement good is one of two alternatives falling within the other prices determinant of demand. The other is a substitute good. An increase in the price of one complement good causes a decrease in demand for the other. A complement good has a negative cross price elasticity. When the terms complements or complement goods are used, they typically means complement-in-consumption (compare this with complement-in-production). Examples of complement goods are golf clubs and golf balls; hamburgers and french fries; and cars and gasoline. In each case, the two goods "go together." People seldom use or consume one without the other.

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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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Today, you are likely to spend a great deal of time flipping through the yellow pages looking to buy either a handcrafted bird feeder or a New York Yankees baseball cap. Be on the lookout for telephone calls from long-lost relatives.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"Use, do not abuse; neither abstinence nor excess ever renders man happy."

-- Voltaire, philosopher

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