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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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CONSUMER CONFIDENCE, AGGREGATE EXPENDITURES DETERMINANT

One of several specific aggregate expenditures determinants assumed constant when the aggregate expenditures line is constructed, and that shifts the aggregate expenditures line when it changes. An increase in consumer confidence causes an increase (upward shift) of the aggregate expenditures line. A decrease in consumer confidence causes a decrease (downward shift) of the aggregate expenditures line. Other notable aggregate expenditures determinants include interest rates, federal deficit, inflationary expectations, and exchange rates.

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Today, you are likely to spend a great deal of time browsing about a thrift store trying to buy either a T-shirt commemorating the first day of spring or a coffee cup commemorating last Friday (you know why). Be on the lookout for jovial bank tellers.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
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