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THREE-SECTOR KEYNESIAN MODEL: A model used to identify equilibrium in Keynesian economics based on aggregate expenditures by the three domestic sectors (household, business, and government). Equilibrium is achieved at the intersection of the aggregate expenditures line, AE = C + I + G, and the 45-degree line, Y = AE. This is Keynesian aggregate expenditures model can be used to analyzed the impact of government fiscal policy on aggregate expenditures and equilibrium.

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ASSUMPTIONS, KEYNESIAN ECONOMICS

The macroeconomic study of Keynesian economics relies on three key assumptions--rigid prices, effective demand, and savings-investment determinants. First, rigid or inflexible prices prevent some markets from achieving equilibrium in the short run. Second, effective demand means that consumption expenditures are based on actual income, not full employment or equilibrium income. Lastly, important savings and investment determinants include income, expectations, and other influences beyond the interest rate. These three assumptions imply that the economy can achieve a short-run equilibrium at less than full-employment production.

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Today, you are likely to spend a great deal of time looking for a downtown retail store looking to buy either a black duffle bag with velcro closures or any book written by Isaac Asimov. Be on the lookout for strangers with large satchels of used undergarments.
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Francis Bacon (1561-1626), a champion of the scientific method, died when he caught a severe cold while attempting to preserve a chicken by filling it with snow.
"I don't subscribe to the thesis, 'Let the buyer beware,' I prefer the disregarded one that goes, 'Let the seller be honest.'"

-- Isaac Asimov, Author

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