MONOPOLY AND EFFICIENCY: A monopoly firm generally produces less output and chargers a higher price than would be the case for a perfectly competitive industry. In particular, the price charged by a monopoly is not equal to (in fact, higher than) the marginal cost of production. The equality between price and marginal cost is THE key indication that resources are allocated efficiently and that society's resources are being used to generate the highest possible level of satisfaction.

     See also | monopoly | market control | marginal cost | demand curve | market failure | monopoly characteristics | monopoly and demand | monopoly profit | monopoly and perfect competition | inefficiency |

MONOPOLY AND EFFICIENCY, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: June 15, 2025].

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A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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