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MARGINAL PROPENSITY TO INVEST: The proportion of each additional dollar of national income that is used for investment expenditures. Or alternatively, this is the change in investment expenditures due to a change in national income. Abbreviated MPI, the marginal propensity to invest is the slope of the investment line used in the analysis of Keynesian economics. As such, it also plays a role in the slope of the aggregate expenditure line and the multiplier effect.

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CHAIRMAN OF THE BOARD OF GOVERNORS, FEDERAL RESERVE SYSTEM

The head of the Board of Governors of the Federal Reserve System, and thus the person who is effectively in charge of monetary policy for the United States. The Chairman, one of the 7 members of the Board of Governors, serves as Chairman for a 4-year term, and also is Chairman of the powerful Federal Open Market Committee--the Federal Reserve Committee that sets the course of monetary policy. Being positioned at the top of the central banking authority of the United States, the Chairman is one of the most powerful, if not THE most powerful, individuals in the economy.

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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
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