Market power exists in oligopolies, monopolistic competitive industries, and monopolies.
Market or monopoly power is the capacity of a firm (or collection of firms) to increase and maintain prices above the level that would prevail under competition. When market power is used, output is decreased and economic welfare is lost.
A scenario known as monopoly occurs when there is only one seller in the market. The monopoly case is viewed as the polar opposite of perfect competition in conventional economic analysis. The industry's downward-sloping demand curve is, by definition, the demand curve that the monopolist faces.
A small number of providers control oligopoly marketplaces, which are dominated by them. All nations and a wide range of industries contain them. Other oligopoly markets are substantially less competitive, though they may at first appear to be so in some cases.
In a market where numerous businesses provide goods or services that are comparable (but not exact substitutes), monopolistic competition is the norm. In a monopolistic competitive industry with low entry and exit barriers, no firm's decisions directly affect those of its rivals.
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