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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Like most consumers, workers, and taxpayers, I engage in market exchanges for a lot of stuff -- food, labor, shelter, entertainment, confectionery products. But as I wandered through the peaceful community of Shady Valley, U. S. of A., I entered a "market" that I would have rather avoided. That's right, as the title indicates, I exchange some crime. I was mugged -- relieved of several valuable possessions -- right in front of the Shady Valley police station. I did the selling and my mugger did the "buying." While my part in the exchange was involuntary, the mugger's part was quite voluntary. In fact, the perpetrator of this crime acted much like any consumer headed to Natural Ned's Nursery and Garden Center in search of a creeping juniper. Let's see why?
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Today, you are likely to spend a great deal of time looking for the new strip mall out on the highway wanting to buy either a how-to book on home remodeling or a tall storage cabinet with five shelves and a secure lock. Be on the lookout for the last item on a shelf.
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This isn't me! What am I?

-- Cato, Roman orator

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