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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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GROSS DOMESTIC PRODUCT, INS AND OUTS Gross domestic product is the total market value of all goods and services produced within the political boundaries of an economy during a given period of time, usually one year. Obtaining this value is not a simple task. It requires combining a lot of information from a number of different sources. For the U.S. economy, this includes trillions of dollars worth of production, hundreds of million of consumers, hundreds of thousands of businesses, and a bunch of market transactions each year.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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"When you play, play hard; when you work, don't play at all. " -- Theodore Roosevelt, 26th US president
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JEP
Journal of Economic Perspectives
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