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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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DOUBLE COUNTING

The act of including the value of intermediate goods more than once in the value of gross domestic product. Because the value, or price, of final goods includes the cost, or value, of all intermediate goods used in production, including market transactions for intermediate goods separately in the measurement of gross domestic product leads to double counting.

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Today, you are likely to spend a great deal of time at a going out of business sale seeking to buy either a desktop calendar with all federal and state holidays highlighted or a half-dozen helium filled balloons. Be on the lookout for jovial bank tellers.
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Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
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