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