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ABSTRACTION: Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is often criticized because it's, well, it's JUST NOT REALISTIC. However, when done correctly (ignoring things that JUST DON'T MATTER), then the pursuit of knowledge is greatly enhanced by abstraction. For example, when travelling cross country along a high-speed interstate highway, a paper road map is a handy tool. It shows towns and cities along the way, the major intersections, rest stop locations, and other important points of interest. However, it ignores unimportant details. It doesn't realistically show the location of every tree, bush, or blade of grass. Why bother? This information won't enhance your road trip.
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CHANGE IN AGGREGATE EXPENDITURES The movement along an aggregate demand curve caused by a change in the price level. A change in aggregate expenditures is ONLY caused by a change in the price level. This is one of two changes related to aggregate demand. The other is a change in aggregate demand. A change in aggregate expenditures is comparable to a change in quantity demanded.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
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"Whenever you fall, pick up something. " -- Oswald Avery, scientist
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KLIC
Kullback-Leibler Information Criterion
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