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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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LONG-RUN INDUSTRY SUPPLY CURVE

The relation between market price and the quantity supplied by all firms in a perfectly competitive industry after the industry has completed its long-run adjustment. The long-run industry supply curve effectively traces out a series of equilibrium prices and quantities that reflect long-run adjustments of a perfectly competitive industry to demand shocks. This long-run adjustment can take one of three paths, indicating an increasing-cost industry, a decreasing-cost industry, and a constant-cost industry.

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APLS

BROWN PRAGMATOX
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Today, you are likely to spend a great deal of time strolling through a department store hoping to buy either decorative garden figurines or a wall poster commemorating last Friday (you know why). Be on the lookout for high interest rates.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
"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

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Personal Income Tax
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