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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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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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PINK FADFLY
[What's This?]
Today, you are likely to spend a great deal of time searching for rummage sales wanting to buy either an AC adapter that won't fry your computer or a case for your designer sunglasses. Be on the lookout for telephone calls from former employers.
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This isn't me! What am I?
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
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"We should never allow ourselves to be bullied by an either-or. There is often the possibility of something better than either of those two alternatives. " -- Mary Parker Follett, management coach
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SIB
Securities and Investment Board
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