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AGGREGATE EXPENDITURE DETERMINANTS: An assortment of ceteris paribus factors that affect aggregate expenditures, but which are assumed constant when the aggregate expenditure line is constructed. Changes in any of the aggregate expenditures determinants cause the aggregate expenditure line to shift. While a wide variety of specific ceteris paribus factors can cause the aggregate expenditure line to shift, it's usually most convenient to group them into the four, broad expenditure categories -- consumption, investment, government purchases, and net exports. The reason is that changes in these expenditures are the direct cause of shifts in the aggregate expenditure line. If any determinant affects aggregate expenditures it MUST affect one of these four expenditures.

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MARKET FOR LEMONS

A market adversely selects only lower quality products for exchange. The market for lemons is an illustration of adverse selection that results from asymmetric information. In this market, because buyers have limited information they offer an average price based on the average quality of the goods. Sellers, however, with better information select to sell lower quality products but not higher quality ones. Two methods of address this problem are signalling and screening. Two related information problems are moral hazard and the principal-agent problem.

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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 genuine down-filled comforter or a 200-foot blue garden hose. Be on the lookout for letters from the Internal Revenue Service.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"There are two big forces at work, external and internal. We have very little control over external forces such as tornadoes, earthquakes, floods, disasters, illness and pain."

-- Leo Buscaglia, Author

ERISA
Employee Retirement Income Security Act of 1974
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