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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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SUPPLY TO A FIRM

The range of quantities of a factor that a firm is able to buy at a range of factor prices. Supply to a firm is a phrase that is most relevant to the study of factor markets, especially when contrasted with supply by a firm. Supply to a firm puts the firm on the buying side of the factor market. Supply by a firm puts the firm on the selling side of the factor market.

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