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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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WAGES, AGGREGATE SUPPLY DETERMINANT

One of several specific aggregate supply determinants assumed constant when the short-run aggregate supply curve is constructed, and that shifts the short-run aggregate supply curve when it changes. An increase in the wages causes a decrease (leftward shift) of the short-run aggregate supply curve. A decrease in the wages causes an increase (rightward shift) of the short-run aggregate supply curve. Other notable aggregate supply determinants include the technology, energy prices, and the capital stock. Wages are an example of a resource price aggregate supply determinant.

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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a replacement washer for your kitchen faucet or a stretchable, flexible watch band. Be on the lookout for malfunctioning pocket calculators.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
"It is very rare that you meet with obstacles in this world (that) the humblest man has not the faculties to surmount. "

-- Henry David Thoreau, philosopher

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