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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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IMPLICIT COST

An opportunity cost that does not involve a monetary payment or any other form of compensation. The monetary payment that is often made to compensate the person who initially foregoes the satisfaction is not made for implicit cost. There is no payment to transfer the burden of the opportunity cost from the original person to someone else. Implicit cost is also occasionally termed implicit opportunity cost.

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Today, you are likely to spend a great deal of time at a flea market seeking to buy either a handcrafted bird house or a weathervane with a chicken on top. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
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