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MARGINAL PROPENSITY TO IMPORT: The proportion of each additional dollar of household income that is used for imports. Or alternatively, this is the change in imports due to a change in disposable income. Abbreviated MPI, the marginal propensity to import plays a minor role in modifying the aggregate expenditure line and the multiplier effect.

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DERIVATION, AGGREGATE EXPENDITURES LINE

An aggregate expenditures line, a graphical depiction of the relation between aggregate expenditures and the level of aggregate income or production, can be derived by sequentially adding expenditures by the four macroeconomic sectors (household, business, government, and foreign). This derivation process begins with the consumption line, then adds investment, government purchases, and finally net exports. The process actually generates three alternative aggregate expenditures lines based on the number of sectors included (two sector, three sector, and four sector).

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