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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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PHYSICAL SCIENCE

The scientific study of the physical world, especially nonhuman, nonsociety phenomena, such as atoms, planets, wildlife, and continental drift. Common disciplines that study these physical phenomena are physics, chemistry, biology, geology, and astronomy. Physical science is one of two broad scientific classifications. The other is social science, which is the study human behavior and society.

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GRAY SKITTERY
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Today, you are likely to spend a great deal of time at a flea market looking to buy either a T-shirt commemorating next Thursday or a birthday gift for your uncle. Be on the lookout for cardboard boxes.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"I not only use all the brains that I have, but all that I can borrow. "

-- Woodrow Wilson, 28th US president

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