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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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MARGINAL REVENUE PRODUCT CURVE

A curve that graphically illustrates the relation between marginal revenue product and the quantity of the variable input, holding all other inputs fixed. This curve indicates the incremental change in total revenue for incremental changes in the variable input. The marginal revenue product curve plays a key role in marginal productivity theory and the economic analysis of factor markets.

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ORANGE REBELOON
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Today, you are likely to spend a great deal of time touring the new suburban shopping complex hoping to buy either a flower arrangement with daisies and carnations for your uncle or a coffee cup commemorating next Thursday. Be on the lookout for small children selling products door-to-door.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"The marvelous thing about human beings is that we are perpetually reaching for the stars. The more we have, the more we want. And for this reason, we never have it all. "

-- Joyce Brothers, psychologist

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National Income and Product Accounts
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