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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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INELASTIC SUPPLY

The general elasticity relation in which relatively large changes in price cause relatively small changes in quantity supplied. Large changes in price cause relatively small changes in quantity supplied or the percentage change in quantity supplied is smaller than the percentage change in price. This characterization of elasticity is most important for the price elasticity of supply. Inelastic supply is one of two general elasticity relations for supply. The other is elastic supply.

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