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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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PRODUCER SURPLUS

The revenue that producers obtain from a good over and above the price paid. This is the difference between the minimum supply price that sellers are willing to accept and the price that they actually receive. A related notion from the demand side of the market is consumer surplus.

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Today, you are likely to spend a great deal of time wandering around the shopping mall trying to buy either a pair of gray heavy duty boot socks or a 50-foot blue garden hose. Be on the lookout for malfunctioning pocket calculators.
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More money is spent on gardening than on any other hobby.
"Opportunities are usually disguised as hard work, so most people don't recognize them."

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