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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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MARKET

The organized exchange of commodities (goods, services, or resources) between buyers and sellers within a specific geographic area and during a given period of time. Markets are the exchange between buyers who want a good (the demand-side of the market) and the sellers who have it (the supply-side of the market).

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Today, you are likely to spend a great deal of time at a crowded estate auction hoping to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for cardboard boxes.
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Parker Brothers, the folks who produce the Monopoly board game, prints more Monopoly money each year than real currency printed by the U.S. government.
"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."

-- Albert Einstein

MC
Marginal Cost
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