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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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PEAK The transition of a business-cycle expansion to a business-cycle contraction. The end of an expansion carries this descriptive term of peak, or the highest level of economic reached in recent times. A peak is one of two turning points. The other, the transition from contraction to expansion, is a trough. Turning points are important because they represent the transition from bad to good or good to bad.
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A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
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"It is not fair to ask of others what you are unwilling to do yourself. " -- Eleanor Roosevelt, diplomat, activist
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ARP
Average Revenue Product
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