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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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COMPARATIVE ADVANTAGE

The ability to produce one good at a relatively lower opportunity cost than other goods, especially compared to production in another country. Every person or country has a comparative advantage in production of at least one good or service, even with relatively limited production technology. A related, but contrasting concept is absolute advantage. Both terms are perhaps most important to the study of international trade, but also provide insight into other exchanges.

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Today, you are likely to spend a great deal of time strolling through a department store wanting to buy either a wall poster commemorating the moon landing or storage boxes for your winter clothes. Be on the lookout for slightly overweight pizza delivery guys.
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Ragnar Frisch and Jan Tinbergen were the 1st Nobel Prize winners in Economics in 1969.
"Anything's possible. You can be told you have a 90% chance or a 50% chance or a 1% chance, but you have to believe, and you have to fight. "

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