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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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GROSS PRIVATE DOMESTIC INVESTMENT

This is the official item in the National Income and Product Accounts maintained by the Bureau of Economics Analysis measuring capital investment expenditures. Gross private domestic investment is expenditures on capital goods to be used for productive activities in the domestic economy that are undertaken by the business sector during a given time period. These expenditures tend to be the least stable of the four expenditures, averaging between 12-18 percent of gross domestic product. This percentage tends to be at the low end during business-cycle contractions and at the high end during business-cycle expansions. The other official expenditures included in the National Income and Product Accounts are personal consumption expenditures, government consumption expenditures and gross investment, and net exports of goods and services.

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