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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 INCREASE, SHORT-RUN AGGREGATE MARKET

A shock to the short-run aggregate market caused by an increase in aggregate demand, resulting in and illustrated by a rightward shift of the aggregate demand curve. An increase in aggregate demand in the short-run aggregate market results in an increase in the price level and an increase in real production. The level of real production resulting from the shock can be greater or less than full-employment real production.

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WHITE GULLIBON
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Today, you are likely to spend a great deal of time touring the new suburban shopping complex seeking to buy either a green and yellow striped sweater vest or a Boston Red Sox baseball cap. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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The 22.6% decline in stock prices on October 19, 1987 was larger than the infamous 12.8% decline on October 29, 1929.
"If you don't know where you are going, any road will get you there."

-- Lewis Carroll, writer

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