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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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DIAMOND-WATER PARADOX

The apparently conflicting and perplexing observation that water, which is more useful than diamonds, has a lower price than diamonds. This paradox was proposed by economists in the 1800s as a means understanding the role utility plays in the demand price of a good by differentiating between total utility and marginal utility.

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Today, you are likely to spend a great deal of time touring the new suburban shopping complex wanting to buy either an AC adapter that won't fry your computer or a case for your designer sunglasses. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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Post WWI induced hyperinflation in German in the early 1900s raised prices by 726 million times from 1918 to 1923.
"Well done is better than well said. "

-- Benjamin Franklin, statesman, inventor

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