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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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AGGREGATE DEMAND DETERMINANTS

An assortment of ceteris paribus factors other than the price level that affect aggregate demand, but which are assumed constant when the aggregate demand curve is constructed. Changes in any of the aggregate demand determinants cause the aggregate demand curve to shift. The specific ceteris paribus factors are commonly grouped by the four, broad expenditure categories--consumption expenditures, investment expenditures, government purchases, and net exports.

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APLS

BLUE PLACIDOLA
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Today, you are likely to spend a great deal of time looking for a downtown retail store trying to buy either a how-to book on surfing the Internet or a computer that can play music and burn CDs. Be on the lookout for slow moving vehicles with darkened windows.
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Paper money used by the Commonwealth of Massachusetts prior to the U.S. Revolutionary War, which was issued against the dictates of Britain, was designed by patriot and silversmith, Paul Revere.
"Progress begins with the belief that what is necessary is possible. "

-- Norman Cousins, editor, writer

SIPP
Survey of Income and Program Participation
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