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AGGREGATE EXPENDITURE LINE: A line representing the relation between aggregate expenditures and gross domestic product used in the Keynesian cross. The aggregate expenditure line is obtained by adding investment expenditures, government purchases, and net exports to the consumption line. As such, the slope of the aggregate expenditure line is largely based on the slope of the consumption line (which is the marginal propensity to consume), with adjustments coming from the marginal propensity to invest, the marginal propensity for government purchases, and the marginal propensity to import. The intersection of the aggregate expenditures line and the 45-degree line identifies the equilibrium level of output in the Keynesian cross.

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Lesson 7: Market | Unit 2: The Numbers Page: 9 of 22

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  • How demand and supply schedules can be used to illustrate the law of demand, the law of supply, and market interaction.
  • How an equilibrium price equates the quantity demanded with the quantity supplied, but nonequilibrium prices do not.


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SHORT-RUN PRODUCTION ANALYSIS

An analysis of the production decision made by a firm in the short run, with the ultimate goal of explaining the law of supply and the upward-sloping supply curve. The central feature of this short-run production analysis is the law of diminishing marginal returns, which results in the short run when larger amounts of a variable input, like labor, are added to a fixed input, like capital. A contrasting analysis is long-run production analysis.

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Today, you are likely to spend a great deal of time searching the newspaper want ads trying to buy either a 50 foot extension cord or a combination CD player, clock radio, and telephone (with answering machine). Be on the lookout for deranged pelicans.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
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