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REAL PURCHASING POWER: The ability to acquire wants-and-needs satisfying goods and services with income or money. The real purchasing power of income or money depends on the prices of the goods and services. If the price level, for example, doubles, then a given amount of money can purchase half as many goods and services.

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MARGINAL PROPENSITY TO INVEST

The change in business investment expenditures induced by a change in income or production (national income or gross domestic product). The marginal propensity to invest (abbreviated MPI) is another term for the slope of the investment line and is calculated as the change in investment divided by the change in income or production. The MPI plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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