Plural of duopoly; markets or industries controlled by exactly two competing companies or producers.
From duo- (Latin 'two') + -opoly (from Greek polein meaning 'to sell'). The term entered economics in the early 20th century to describe market structures between perfect competition and monopoly.
Duopolies are sneaky economic situations—while two competitors seem like they're fighting, they can quietly collude to keep prices high, which is why regulators watch them closely, especially in industries like telecommunications.
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