Which concept refers to the domination of a market by a few companies?

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Oligopoly refers to a market structure where a few companies dominate the market. This could result in limited competition and the ability of these companies to control prices and supply. Monopoly refers to a situation where one company has complete control over the market, while oligarchy refers to a form of government where a small group of people hold all the power. Plutocracy refers to a system where wealth determines political power.

Which Concept Refers to the Domination of a Market by a Few