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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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AVERAGE REVENUE PRODUCT CURVE

A curve that graphically illustrates the relation between average revenue product and the quantity of the variable input, holding all other inputs fixed. This curve indicates the per unit revenue at each level of the variable input. The average revenue product curve is one of two related curves often used in the analysis of factor demand. The other, and more important, is marginal revenue product curve.

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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites seeking to buy either storage boxes for your family photos or a large, stuffed giraffe. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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John Maynard Keynes was born the same year Karl Marx died.
"How wonderful it is that nobody need wait a single moment before starting to improve the world."

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