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duopoly

noun
🔊/djuːˈɒpəli/
🔊/duːˈɑːpəli/
(plural duopolies)
(business商业)
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  1. a situation in which only two companies or organizations do all the trade in a particular product or service （商品或服务的）两强垄断compare monopoly, oligopoly
    Word Origin1920s: from duo-, on the pattern of monopoly.