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KEYNESIAN EQUILIBRIUM: The state of the macroeconomy in which aggregate expenditures are equal to aggregate output. This is illustrated using the income-expenditure model, or Keynesian cross, as the intersection of the aggregate expenditures line and the 45-degree line. The aggregate expenditures line is the summation of consumption expenditures, investment expenditures, government purchases, and net exports. The 45-degree line represents all combinations in which aggregate expenditures equal aggregate output. Keynesian equilibrium is also represented by the saving-investment, or injection-leakage, model as the intersection between the injection line (investment expenditures, government purchases, and exports) and the leakage line (saving, taxes, and imports).
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MARGINAL PROPENSITY TO INVEST The change in business investment expenditures induced by a change in income or production (national income or gross domestic product). The marginal propensity to invest (abbreviated MPI) is another term for the slope of the investment line and is calculated as the change in investment divided by the change in income or production. The MPI plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.
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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers looking to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for the last item on a shelf.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
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"I was always looking outside myself for strength and confidence, but it comes from within. It is there all the time. " -- Anna Freud, psychologist
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