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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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PERFECT COMPETITION, REVENUE DIVISION

The marginal approach to analyzing a perfectly competitive firm's short-run profit maximizing production decision can be used to identify the division of total revenue among variable cost, fixed cost, and economic profit. The U-shaped cost curves used in this analysis provide all of the information needed on the cost side of the firm's decision. The demand curve facing the firm (which is also the firm's average revenue and marginal revenue curves) provides all of the information needed on the revenue side.

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GREEN LOGIGUIN
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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 set of steel-belted radial snow tires or a wall poster commemorating the 2000 Presidential election. Be on the lookout for rusty deck screws.
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John Maynard Keynes was born the same year Karl Marx died.
"Unless you are willing to drench yourself in your work beyond the capacity of the average man, you are just not cut out for positions at the top."

-- J. C. Penney, Retailer

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