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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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MARGINAL PROPENSITY TO SAVE The proportion of each additional dollar of household income that is used for saving. The marginal propensity to save (abbreviated MPS) is another term for the slope of the saving line and is calculated as the change in saving divided by the change in income. The MPS plays a central role in Keynesian economics. It quantifies the saving-income relation, which is the flip side of the consumption-income relation, and thus it reflects the fundamental psychological law. It is also a critical to the multiplier process. A related saving measure is the average propensity to save.
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BLUE PLACIDOLA
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Today, you are likely to spend a great deal of time at a flea market seeking to buy either a replacement battery for your pocket calculator or a how-to book on home remodeling. Be on the lookout for slow moving vehicles with darkened windows.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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"The greatest glory in living lies not in never falling, but in rising every time we fall. " -- Nelson Mandela, statesman
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BPEA
Brookings Papers on Economic Activity
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