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THREE-SECTOR INJECTIONS-LEAKAGES MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment and government purchases) and leakages (saving and taxes) for the three domestic sectors (household, business, and government). Equilibrium is achieved at the intersection of the saving and tax line, S + T, and the investment and government purchases line, I + G.
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                           AGGREGATE EXPENDITURES EQUATION: An equation that summarizes the four aggregate expenditures on gross domestic product by the four macroeconomic sectors. In the study of Keynesian economics, this equation is commonly used to summarize the demand side of the macroeconomy. The aggregate expenditures equation actually comes in three different versions depending on how many of the four sectors and their expenditures are included. The aggregate expenditures equation is the sum of the four aggregate expenditures (consumption expenditures, investment expenditures, government purchases, and net exports). This equation provides a short-hand notion that summarizes the demand side of the economy.The general aggregate expenditures equation is: where: AE is aggregate expenditures, C is consumption expenditures, I is investment expenditures, G is government purchases, and X-M is net exports, exports (X) minus imports (M).This particular version of the aggregate expenditures equation is for all four macroeconomic sectors (household sector, business sector, government sector, and foreign sector). In some circumstances reduced versions, with fewer sectors, are more useful. A three-sector version that includes the household, business, and government sectors is: And the simplest aggregate expenditures equation is for the two private sectors--household and business. It is specified as:
 Recommended Citation:AGGREGATE EXPENDITURES EQUATION, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 7, 2025]. Check Out These Related Terms... | | | | | | | | | | | Or For A Little Background... | | | | | | | | | | | | | | | | | | | | | And For Further Study... | | | | | | | | | | | | | |
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Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either a Boston Red Sox baseball cap or a square lamp shade with frills along the bottom. Be on the lookout for mail order catalogs with hidden messages. Your Complete Scope
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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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"It is not because things are difficult that we do not dare; it is because we do not dare that they are difficult. " -- Seneca, statesman, dramatist, philosopher
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