duopoly

/duːˈɑːpəli/
noun
  1. A situation in which two companies or entities control all or most of the market for a product or service.
    • A duopoly can lead to higher prices because there is little competition.
    • The government investigated whether the duopoly in the telecom sector was harming consumers.
    • The soft drink market is a classic duopoly, with Coca-Cola and Pepsi dominating.
Antonyms