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C: The standard abbreviation for consumption expenditures by the household sector, especially when used in the study of macroeconomics. This abbreviation is most often seen in the consumption function, specified as C = a + bY, where Y stands for national income. It is also used for the aggregate expenditure equation, AE = C + I + G + (X - M), where I, G, and (X - M) represent expenditures by the other three macroeconomic sectors, business, government, and foreign.

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MARGINAL PROPENSITY TO INVEST

The change in business investment expenditures induced by a change in income or production (national income or gross domestic product). The marginal propensity to invest (abbreviated MPI) is another term for the slope of the investment line and is calculated as the change in investment divided by the change in income or production. The MPI plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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Today, you are likely to spend a great deal of time at a garage sale looking to buy either a remote controlled World War I bi-plane or a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for deranged pelicans.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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