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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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TOTAL COST CURVES

The total cost of producing a good can be represented by three related curves, total cost curve, total variable cost curve, and total fixed cost curve. The total cost curve is the vertical summation of the total variable cost curve and the total fixed cost curve.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club trying to buy either a pair of red and purple designer socks or a T-shirt commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki. Be on the lookout for gnomes hiding in cypress trees.
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Before 1933, the U.S. dime was legal as payment only in transactions of $10 or less.
"Inside the ring or out, ain't nothing wrong with going down. It's staying down that's wrong. "

-- Muhammad Ali

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