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MARGINAL EFFICIENCY OF INVESTMENT: The anticipated rate of return on a capital investment project undertaken by a business firm. Businesses typically compare the marginal efficiency of investment, abbreviated MEI, on physical capital with interest rate returns on financial capital when deciding to undertake an investment project. Because different investment projects have different returns, businesses often have a range of alternatives projects from which to choose. Combining all projects throughout the economy gives rise to an investment demand curve relating investment expenditures to the interest rate.

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CONSUMER CONFIDENCE, AGGREGATE DEMAND DETERMINANT

One of several specific aggregate demand determinants assumed constant when the aggregate demand curve is constructed, and which shifts the aggregate demand curve when it changes. An increase in consumer confidence causes an increase (rightward shift) of the aggregate demand curve. A decrease in consumer confidence causes a decrease (leftward shift) of the aggregate demand curve. Other notable aggregate demand determinants include interest rates, federal deficit, inflationary expectations, and the money supply.

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