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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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AVERAGE PROPENSITY TO CONSUME

The proportion of household income that is used for consumption expenditures. The average propensity to consume (abbreviated APC) is really nothing more than average consumption. Together with the average propensity to save, it indicates how a given level of income is divided between consumption and saving. A related consumption measure is the marginal propensity to consume.

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