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DERIVATION, AGGREGATE EXPENDITURES LINE: An aggregate expenditures line, a graphical depiction of the relation between aggregate expenditures and the level of aggregate income or production, can be derived by sequentially adding expenditures by the four macroeconomic sectors (household, business, government, and foreign). This derivation process begins with the consumption line, then adds investment, government purchases, and finally net exports. The process actually generates three alternative aggregate expenditures lines based on the number of sectors included (two sector, three sector, and four sector).

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ECONOMIC PROFIT

The difference between the total opportunity cost of production and the total revenue received by a firm. Economic profit is what remains after ALL opportunity cost associated with production (including a normal profit) is deducted from the revenue generated by the production. Economic profit is one of three alternative notions of profit. The other two are accounting profit and normal profit.

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Today, you are likely to spend a great deal of time flipping through the yellow pages looking to buy either a dozen high trajectory optic orange golf balls or a large red and white striped beach towel. Be on the lookout for door-to-door salesmen.
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Francis Bacon (1561-1626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.
"A genius is a talented person who does his homework."

-- Thomas Edison

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United States Department of Agriculture
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