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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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FACTOR DEMAND ELASTICITY

The elasticity of a factor demand curve is affected by four items: (1) the price elasticity of demand for the good produced, (2) the production function technology and elasticity of marginal physical product, (3) the ease of factor substitutability, and (4) the share of the factor's cost relative to total cost. Changes in any of these four items cause the price elasticity of factor demand to change. In other words, the quantity of factor services demanded becomes more or less sensitive to changes in the factor price.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex seeking to buy either any book written by Stephan King or a T-shirt commemorating next Thursday. Be on the lookout for florescent light bulbs that hum folk songs from the sixties.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"Never confuse a single defeat with a final defeat."

-- F. Scott Fitzgerald, writer

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