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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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NATIONAL INCOME AND PRODUCT ACCOUNTS

The official government system of collecting, processing, and reporting assorted production and income measures used to track aggregate activity in the macroeconomy. This system of accounts, maintained by the Bureau of Economic Analysis in the Department of Commerce, is the source of official estimates of gross domestic product, net domestic product, national income, personal income, disposable income, gross national product, and related measures.

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Today, you are likely to spend a great deal of time at an auction looking to buy either a rechargeable flashlight or storage boxes for your computer software CDs. Be on the lookout for the last item on a shelf.
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