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ABSTRACTION METHODS: Abstraction is the process of simplifying the complexities of the real world by ignoring (hopefully) unimportant details, especially (for our purposes) while doing economic analysis. Three common methods of actual, real world abstraction used in economic theories are words, graphs, and equations. Words can be misunderstood. Graphs are a little more precise. And equations tend to be the most precise of the three.

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AGGREGATE DEMAND SHIFTS

Changes in the aggregate demand determinants cause the aggregate demand curve to shift. The mechanism is comparable to that for market demand determinants and market demand. There are two alternatives--an increase in aggregate demand and a decrease in aggregate demand. An increase in spending by any of the four sectors--household, business, government, and foreign--shifts the aggregate demand curve to right. A decrease in spending by these four sectors shifts the aggregate demand curve to left.

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APLS

ORANGE REBELOON
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Today, you are likely to spend a great deal of time at the confiscated property police auction looking to buy either a flower arrangement for your aunt or a birthday greeting card for your uncle. Be on the lookout for high interest rates.
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In the early 1900s around 300 automobile companies operated in the United States.
"In war, there is no second prize for the runner-up."

-- Omar Bradley, US Army general

BPEA
Brookings Papers on Economic Activity
A PEDestrian's Guide
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