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By analogy with monopoly based on Ancient Greek δύο ‎(dúo, two) + πωλέω ‎(pōléō, I sell).


duopoly ‎(countable and uncountable, plural duopolies)

  1. (economics) A market situation in which two companies exclusively provide a particular product or service.
  2. (by extension) The domination of a field of endeavor by two people or entities.
    • 2012 June 29, Kevin Mitchell, “Roger Federer back from Wimbledon 2012 brink to beat Julien Benneteau”, the Guardian:
      In 2011, his spirit and body were shattered by Jo-Wilfried Tsonga in the semi-finals. Last night, the stakes were just as high – even though the tournament is not out of the first week – because there is a creeping perception that the Federer-Nadal duopoly is slowly giving way under pressure from below.


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