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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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ORANGE REBELOON
[What's This?]

Today, you are likely to spend a great deal of time at a crowded estate auction looking to buy either a pair of blue silicon oven mitts or a coffee cup commemorating the 2000 Olympics. Be on the lookout for broken fingernail clippers.
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This isn't me! What am I?

A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"Every man must decide whether he will walk in the light of creative altruism or in the darkness of destructive selfishness."

-- Martin Luther King, Jr., clergyman

IIA
Irrelevance of Independent Alternatives
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