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OLIGOPOLISTIC BEHAVIOR: Oligopolistic industries are nothing if not diverse. Some sell identical products, others differentiated products. Some have three or four firms of nearly equal size, others have one large dominate firm (a clear industry leader) and a handful of smaller firms (that follow the leader). Whatever products they may sell, and however they may be organized, oligopolistic industries share several behavioral tendencies, including (1) interdependence, (2) rigid prices, (3) nonprice competition, (4) mergers, and (5) collusion. In other words, each oligopolistic firm keeps a close eye on the decisions made by other firms in the industry (interdependence), are reluctant to change prices (rigid prices), but instead try to attract the competitors customers using incentives other than prices (nonprice competition), and when they get tired of competing with their competitors they are inclined to cooperate either legally (mergers) or illegally (collusion).

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MONOPOLISTIC COMPETITION, LONG-RUN ADJUSTMENT

A monopolistically competitive industry undertakes a two-part adjustment to equilibrium in the long run. One is the adjustment of each monopolistically competitive firm to the appropriate factory size that maximizes long-run profit. The other is the entry of firms into the industry or exit of firms out of the industry, to eliminate economic profit or economic loss. The end result of this long-run adjustment is two equilibrium conditions--one for profit maximization, the other for zero economic profit.

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Today, you are likely to spend a great deal of time looking for a downtown retail store seeking to buy either a case for your designer sunglasses or arch supports for your shoes. Be on the lookout for jovial bank tellers.
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Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"We succeed in enterprises (that) demand the positive qualities we possess, but we excel in those (that) can also make use of our defects. "

-- Alexis de Tocqueville, statesman, author

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