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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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AVERAGE REVENUE, MONOPOLISTIC COMPETITION

The revenue received for selling a good per unit of output sold, found by dividing total revenue by the quantity of output. Average revenue often goes by a simpler and more widely used term... price. For a monopolistically competitive firm average revenue is greater than marginal revenue. Average revenue for a monopolistically competitive firm is often depicted by a negatively-sloped average revenue curve.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time at a going out of business sale seeking to buy either a birthday greeting card for your aunt or a wall poster commemorating the moon landing. Be on the lookout for poorly written technical manuals.
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This isn't me! What am I?

Woodrow Wilson's portrait adorned the $100,000 bill that was removed from circulation in 1929. Woodrow Wilson was removed from circulation in 1924.
"When I look back on all these worries, I remember the story of the old man who said on his deathbed that he had had a lot of trouble in his life, most of which had never happened. "

-- Winston Churchill, British statesman

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