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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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DETERMINANT

This has one of two somewhat related meanings. First, it refers to a ceteris paribus factor that is held constant when a curve or graphical relation between two other variables is constructed. Second, it refers to a known directional change in a variable resulting from the disruption of an equilibrium that is identified using comparative statics.

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