Control over the production and sale of a product or service by a few companies.
Oligopoly
When a particular market is controlled by a small group of firms.
An oligopoly is much like a monopoly, in which only one company exerts control over most of a market. In an oligopoly there are at least two firms.
Investopedia Commentary
The retail gas market is a good example of oligopoly - there are a small number of firms that control a large majority of the market.
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See also: Cartel, Duopoly, Monopoly, Oligopsony, Perfect Competition
Also spelled: oligopolies, oligopolistic
oligopoly