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SLOPE, AGGREGATE EXPENDITURES LINE: The positive slope of the aggregate expenditures line is the sum of the marginal propensity to consume (MPC), marginal propensity to invest (MPI), and marginal propensity for government purchases (MPG), less the marginal propensity to import (MPM). This slope is greater than zero but less than one, reflecting induced expenditures by the four macroeconomic sectors (household, business, government, and foreign). The slope of the aggregate expenditures line determines the magnitude of the multiplier process.

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CONTRACTION: A phase of the business cycle characterized by a general period of declining economic activity. A contraction is one of two basic business cycle phases. The other is expansion. The transition from contraction to expansion is termed a trough and the transition from expansion to contraction is termed a peak. The popular term for contraction, one that frequent shows up in the media, is recession. Should you check out the entry recession, you will see information that is essentially identical to that presented here, because they are two terms for the same phenomenon.

     See also | business cycle | recession | expansion | peak | trough | recovery | real gross domestic product | unemployment rate | unemployment | full employment | inflation | aggregate expenditures | National Income and Product Accounts | Great Depression |


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CONTRACTION, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 5, 2025].


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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 going from convenience store to convenience store hoping to buy either storage boxes for your computer software CDs or a set of tires. Be on the lookout for rusty deck screws.
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Much of the $15 million used by the United States to finance the Louisiana Purchase from France was borrowed from European banks.
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