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PERFECT COMPETITION, REVENUE DIVISION: The marginal approach to analyzing a perfectly competitive firm's short-run profit maximizing production decision can be used to identify the division of total revenue among variable cost, fixed cost, and economic profit. The U-shaped cost curves used in this analysis provide all of the information needed on the cost side of the firm's decision. The demand curve facing the firm (which is also the firm's average revenue and marginal revenue curves) provides all of the information needed on the revenue side.

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AGGREGATE EXPENDITURES EQUATION

An equation that summarizes the four aggregate expenditures on gross domestic product by the four macroeconomic sectors. In the study of Keynesian economics, this equation is commonly used to summarize the demand side of the macroeconomy. The aggregate expenditures equation actually comes in three different versions depending on how many of the four sectors and their expenditures are included.

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Today, you are likely to spend a great deal of time flipping through the yellow pages trying to buy either a velvet painting of Elvis Presley or a wall poster commemorating yesterday. Be on the lookout for the last item on a shelf.
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Approximately three-fourths of the U.S. paper currency in circular contains traces of cocaine.
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