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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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KEYNESIAN EQUILIBRIUM

The state of macroeconomic equilibrium identified by the Keynesian model when the opposing forces of aggregate expenditures equal aggregate production achieve a balance with no inherent tendency for change. Once achieved, a Keynesian equilibrium persists unless or until it is disrupted by an outside force, especially changes in autonomous expenditures.

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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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