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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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SHORT-RUN AGGREGATE MARKET

A macroeconomic model relating the price level and real production under the assumption that SOME prices are inflexible, especially resource prices. This is one of two aggregate market submodels used to analyze business cycles, gross production, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The other is the long-run aggregate market. The short-run aggregate market isolates the interaction between aggregate demand and short-run aggregate supply. The key assumption of this model is that SOME prices, especially resource prices, are inflexible. The primary result of this model is that the economy can achieve short-run equilibrium at real production that is either greater than or less than full-employment.

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