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I: The standard abbreviation for investment expenditures by the business sector, especially when used in the study of macroeconomics. This abbreviation is most often seen in the aggregate expenditure equation, AE = C + I + G + (X - M), where C, G, and (X - M) represent expenditures by the other three macroeconomic sectors, household, business, and foreign.

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INCREASING MARGINAL RETURNS

In the short-run production by a firm, an increase in the variable input results in an increase in the marginal product of the variable input. Increasing marginal returns typically surface when the first few quantities of a variable input are added to a fixed input. This is one of two alternatives for marginal returns. The other is decreasing marginal returns. A related phenomenon for long-run production is increasing returns to scale.

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BLUE PLACIDOLA
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Today, you are likely to spend a great deal of time flipping through the yellow pages hoping to buy either a desktop calendar with all federal and state holidays highlighted or a half-dozen helium filled balloons. Be on the lookout for slow moving vehicles with darkened windows.
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A half gallon milk jug holds about $50 in pennies.
"It had long since come to my attention that people of accomplishment rarely sat back and let things happen to them. They went out and happened to things. "

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ERISA
Employee Retirement Income Security Act of 1974
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