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AE LINE: Another term for aggregate expenditure line, which is 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 2: Economic Science | Unit 3: Verification Page: 12 of 20

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  • How an hypothesis is verified using real world data.
  • Ways to obtain data that can be used to test an hypothesis.
  • The importance of the ceteris paribus assumption that other factors remain unchanged when testing an hypothesis.
  • What it means to the scientific method when an hypothesis does and does not agree with real world data.
  • How continually testing an hypothesis that agrees with real world data eventually gives us a principle.
  • Why an hypothesis that does not agree with real world data can be just as valuable to the scientific method as one that does not.

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EFFECTIVE DEMAND

A key conceptual notion of Keynesian economics stipulating that the aggregate expenditures on real production is based on existing or actual income rather than the income that would be generated with full employment of resources. Effective demand is embodied in the aggregate expenditures line, which has a positive slope, but a slope of less than one. This concept was proposed by Thomas Robert Malthus in the early 1800s as a counter argument to Say's law found in classical economics and then found new life when John Maynard Keynes developed his theory in the 1930s.

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Today, you are likely to spend a great deal of time at a garage sale seeking to buy either a coffee cup commemorating the 2000 Olympics or a birthday gift for your grandmother. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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The portion of aggregate output U.S. citizens pay in taxes (30%) is less than the other six leading industrialized nations -- Britain, Canada, France, Germany, Italy, or Japan.
"Now is the only time there is. Make your now wow, your minutes miracles, and your days pay. Your life will have been magnificently lived and invested, and when you die you will have made a difference."

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