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THREE-SECTOR AGGREGATE EXPENDITURES LINE: A graphical depiction of the relation between aggregate expenditures by the three domestic macroeconomic sectors (household, business, and government) and the level of aggregate income or production. The three-sector aggregate expenditures line combines consumption expenditures, investment expenditures, and government purchases. The slope of this aggregate expenditures line is based on the marginal propensity to consume, adjusted for marginal propensities of the other expenditures that are assumed to be induced when constructing the line. This is one of three aggregate expenditures lines based on the number of sectors included. The others are the two-sector aggregate expenditures line and the four-sector aggregate expenditures line.

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AUTONOMOUS CONSUMPTION

Household consumption expenditures that do not depend on income or production (especially disposable income, national income, or even gross domestic product). That is, changes in income do not generate changes in consumption. Autonomous consumption is best thought of as a baseline or minimum level of consumption that the household sector undertakes in the unlikely event that income falls to zero. It is measured by the intercept term of the consumption function or the consumption line. The alternative to autonomous consumption is induced consumption, which does depend on income.

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