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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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MARGINAL REVENUE CURVE, MONOPOLY

A curve that graphically represents the relation between the marginal revenue received by a monopoly for selling its output and the quantity of output sold. Because a monopoly is a price maker and faces a negatively-sloped demand curve, its marginal revenue curve is also negatively sloped and lies below its average revenue (and demand) curve. A monopoly maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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Today, you are likely to spend a great deal of time at a going out of business sale trying to buy either income tax software or a how-to book on the art of negotiation. Be on the lookout for malfunctioning pocket calculators.
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Three-forths of the gold mined each year is used to manufacture jewelry.
"To sit back and let fate play its hand out, and never influence it, is not the way man was meant to operate."

-- John Glenn, astronaut, U.S. senator

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Bureau of Agricultural Economics
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