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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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CHECK CLEARING

The process in which reserves or funds are transferred among banks to settle the accounts of checks written on one account and deposited into another. Check clearing is the heart and sole of daily banking activity and the final step in the use of checkable deposits as the medium of exchange for conducting transactions in the economy. Check clearing is facilitated by central clearinghouses, including the Federal Reserve System and a number of private organizations. The check clearing process is also a key component of the money creation process.

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The Dow Jones family of stock market price indexes began with a simple average of 11 stock prices in 1884.
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