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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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OTHER PRICES, DEMAND DETERMINANT

The prices of other goods that influence the decision to purchase a particular good, which are assumed constant when a demand curve is constructed. Other prices can be for goods that are either substitutes-in-consumption or complements-in-consumption. This is one of five demand determinants that shift the demand curve when they change. The other four are other prices, buyers' preferences, buyers' expectations, and number of buyers.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either decorative garden figurines or a wall poster commemorating last Friday (you know why). Be on the lookout for the last item on a shelf.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
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RGDP
Real Gross Domestic Product
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