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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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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 searching for a specialty store trying to buy either one of those memory foam pillows or a remote controlled train set. Be on the lookout for telephone calls from long-lost relatives.
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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
"Far and away the best prize that life has to offer is the chance to work hard at work worth doing."

-- Theodore Roosevelt, 26th US president

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