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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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DETERMINANTS

Ceteris paribus factors that are held constant when a curve is constructed. Changes in these factors then cause the curve to shift to a new location. The most common determinants are demand determinants for the demand curve and supply determinants for the supply curve. Other curves used in the analysis of economics also have notable determinants, including the production possibilities curve, the aggregate demand curve, the aggregate supply curve, and the short-run average cost curve.

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