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HERFINDAHL-HIRSHMAN INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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OLIGOPOLY AND MONOPOLISTIC COMPETITION

Oligopoly and monopolistic competition have some similarities, but also have a few important differences. Both are examples of imperfect competition on the market structure continuum between ideals of perfect competition and monopoly. However, oligopoly contains a small number of large firms and monopolistic competition contains a large number of small firms. The dividing line between oligopoly and monopolistic competition can be blurred due to the number of firms in the industry.

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