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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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SOCIAL SCIENCE

The scientific study of society--of human behavior and of social interactions. Economics is one of several social sciences. Others are sociology, political science, and anthropology. Economics is considered a social science because it seeks to explain how society deals with the scarcity problem.

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Today, you are likely to spend a great deal of time at a going out of business sale seeking to buy either super soft, super cuddly, stuffed animals or a large stuffed brown and white teddy bear. Be on the lookout for malfunctioning pocket calculators.
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The word "fiscal" is derived from a Latin word meaning "moneybag."
"Whenever you fall, pick up something. "

-- Oswald Avery, scientist

IIA
Irrelevance of Independent Alternatives
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