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KEYNESIAN MODEL: A macroeconomic model based on the principles of Keynesian economics that is used to identify the equilibrium level of, and analyze disruptions to, aggregate production and income. This model identifies equilibrium aggregate production and income as the intersection of the aggregate expenditures line and the 45-degree line. The Keynesian model comes in three basic variations designated by the number of macroeconomic sectors included--two-sector, three-sector, and four sector. The Keynesian model is also commonly presented in the form of injections and leakages in addition to the standard aggregate expenditures format. This model is used to analyze several important topics and issues, including multipliers, business cycles, fiscal policy, and monetary policy.

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Lesson 13: Aggregate Demand | Unit 2: Doing More Page: 4 of 22

Topic: Expenditures <=PAGE BACK | PAGE NEXT=>

Aggregate demand is expenditures made by all members of society, that is, aggregate expenditures.

A definition:

Aggregate expenditures are the total expenditures on gross domestic product undertaken in a given time period.

  • Society is grouped into four sectors, households, business, government, and foreign.

Expenditures by each sector are:

  • Household Consumption
  • Business Investment
  • Government Government Purchases
  • Foreign Net exports

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DISECONOMIES OF SCALE

Increasing long-run average cost that occurs as a firm increases all inputs and expands its scale of production. Diseconomies of scale result from decreasing returns to scale and are graphically illustrated by a positively-sloped long-run average cost curve. Diseconomies of scale usually occur for relatively large levels of production and overwhelm economies of scale that occurs at relatively small production levels. Together, economies of scale and diseconomies of scale create a U-shaped long-run average cost curve.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex looking to buy either a set of serrated steak knives, with durable plastic handles or a pair of blue silicon oven mitts. Be on the lookout for the happiest person in the room.
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Only 1% of the U.S. population paid income taxes when the income tax was established in 1914.
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