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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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ECONOMIC SCIENCE

The application of the scientific method to economic phenomena and topics related to the fundamental problem of scarcity. Economic science, also termed positive economics, is one of several social sciences that apply the scientific method to the study of human behavior.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex trying to buy either a set of tires or a birthday gift for your grandfather. Be on the lookout for letters from the Internal Revenue Service.
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There were no banks in colonial America before the U.S. Revolutionary War. Anyone seeking a loan did so from another individual.
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