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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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RATIONAL BEHAVIOR

The notion that people make decisions based on the desire to obtain the greatest amount of satisfaction. Rational behavior essentially means that people prefer more to less. The presumption of rational behavior underlies most economic analysis, especially that applied to consumer demand theory.

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Today, you are likely to spend a great deal of time driving to a factory outlet looking to buy either decorative celebrity figurines or a flower arrangement with anything but tulips for your grandfather. Be on the lookout for malfunctioning pocket calculators.
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In 1914, Ford paid workers who were age 22 or older $5 per day -- double the average wage offered by other car factories.
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