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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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GOLD CERTIFICATES

Paper currency issued and authorized by the U.S. Department of the Treasury that is, in principle, backed up by, and exchangeable for, an equivalent value of gold. Gold certificates were in circulation as a medium of exchange for the U.S. economy during two periods, 1865 to 1922 and 1928 to 1934. A similar form of paper currency is silver certificates.

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Today, you are likely to spend a great deal of time at a crowded estate auction looking to buy either a T-shirt commemorating the first day of winter or software that won't crash your computer. Be on the lookout for small children selling products door-to-door.
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The first paper notes printed in the United States were in denominations of 1 cent, 5 cents, 25 cents, and 50 cents.
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