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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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AGGREGATE SUPPLY DECREASE, LONG-RUN AGGREGATE MARKET

A shock to the long-run aggregate market caused by a decrease in aggregate supply, resulting in and illustrated by a leftward shift of the long-run aggregate supply curve. A decrease in aggregate supply in the long-run aggregate market results in an increase in the price level and a decrease in real production. The level of real production resulting from the shock is a smaller level of full-employment real production.

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Today, you are likely to spend a great deal of time wandering around the shopping mall wanting to buy either a revolving spice rack or a how-to book on home repairs. Be on the lookout for door-to-door salesmen.
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Cyrus McCormick not only invented the reaper for harvesting grain, he also invented the installment payment for selling his reaper.
"The greatest use of life is to spend it for something that will outlast it."

-- William James, psychologist

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