Duopoly vs. Oligopoly — What's the Difference?

A duopoly (from Greek δύο, duo "two" and πωλεῖν, polein "to sell") is a type of oligopoly where two firms have dominant or exclusive control over a market. It is the most commonly studied form of oligopoly due to its simplicity.

An oligopoly (from Greek ὀλίγος, oligos "few" and πωλεῖν, polein "to sell") is a market form wherein a market or industry is dominated by a small group of large sellers (oligopolists).

An economic or political condition in which power is concentrated in two persons or groups.

A market condition in which sellers are so few that the actions of any one of them will materially affect price and have a measurable impact on competitors.

(economics) A market situation in which two companies exclusively provide a particular product or service.

An economic condition in which a small number of sellers exert control over the market of a commodity.

(by extension) The domination of a field of endeavor by two people or entities.

(economics) a market in which control over the supply of a commodity is in the hands of a small number of producers and each one can influence prices and affect competitors

Situation in which two or more TV or radio-stations in the same city or community share common ownership.