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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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TOTAL REVENUE

The revenue received by a firm for the sale of its output. Total revenue is one two bits of information a firm needs to calculate economic profit, the other is total cost. In general, total revenue is the price times quantity--the price received for selling a good times the quantity of the good sold at that price. For a perfectly competitive firm, which receives a single unchanging price for all output sold, the calculation is relatively easy. For other real world firms, that charge different prices to different buyers for different quantities, the calculation can be more complex. Two other revenue measures directly related to total revenue are average revenue and marginal revenue. Total revenue is often depicted as a total revenue curve.

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