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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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RISK POOLING

The process of combining the risks facing individuals into larger groups. This process can be used effectively to transfer individual risks to the entire group. This makes it possible to calculated the risk for the group. Risk pooling is the standard technique that enables the provision of insurance services.

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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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