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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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FACTOR DEMAND ELASTICITY

The elasticity of a factor demand curve is affected by four items: (1) the price elasticity of demand for the good produced, (2) the production function technology and elasticity of marginal physical product, (3) the ease of factor substitutability, and (4) the share of the factor's cost relative to total cost. Changes in any of these four items cause the price elasticity of factor demand to change. In other words, the quantity of factor services demanded becomes more or less sensitive to changes in the factor price.

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