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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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CONSUMPTION EXPENDITURES

Expenditures made by the household sector on final goods and services, or gross domestic product. Consumption expenditures play a central role in macroeconomic activity affecting both short-run business cycles and long-run economic growth. The motivation behind consumption expenditures is the general process of consumption, which is the use of goods and services to satisfy wants and needs, and are officially measured by personal consumption expenditures. These are one of four expenditures on gross domestic product. The other three are investment expenditures, government purchases, and net exports.

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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
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