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Oligopoly vs Monopoly

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OLIGOPOLY, CHARACTERISTICS:

The three most important characteristics of oligopoly are: (1) an industry dominated by a small number of large firms, (2) firms sell either identical or differentiated products, and (3) the industry has significant barriers to entry.
These three characteristics underlie common oligopolistic behavior, including interdependent actions and decision making, the inclination to keep prices rigid, the pursuit of nonprice competition rather than price competition, the tendency for firms to merge, and the incentive to form collusive arrangements.
Small Number of Large Firms

The most important characteristic of oligopoly is an industry dominated by a small number of large firms, each of which is relatively large compared to the overall size of the market. This characteristics gives each of the relatively large firms substantial market control. While each firm does not have as much market control as monopoly, it definitely has more than a monopolistically competitive firm.
The total number of firms in an oligopolistic industry is not the key consideration. A oligopoly firm actually can have a large number of firms, approaching that of any monopolistically competitive industry. However, the distinguishing feature is that a few of the firms are relatively large compared to the overall market. A given industry with a thousand firms, for example, is considered oligopolistic if the top five firms produce half of the industry's total output.

The hypothetical Shady Valley soft drink market contains 20 firms, but it is oligopolistic because the four largest firms account for over 60 percent of total industry sales and the top eight firms account for almost 80 percent.

Identical or Differentiate Products

Some oligopolistic industries produce identical products, like perfect competition in this regard, while others produce differentiated

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