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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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INSTITUTION

An established method or way of performing an activity that is widely accepted throughout society. Institutions provide the rules, guidelines, and structure needed to carry out day-to-day economic activities, such as production, consumption, and exchange.

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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 luggage with wheels or a birthday gift for your aunt. Be on the lookout for fairy dust that tastes like salt.
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Two and a half gallons of oil are needed to produce one automobile tire.
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