Relating to or describing a market controlled by exactly two competing companies.
From duopoly + -istic (a suffix forming adjectives meaning 'relating to'). The term entered economic discourse in the 20th century to describe market structures.
A duopolistic market like smartphone operating systems (iOS and Android) looks competitive from the outside, but both companies have enormous power over app developers and consumers, which is why regulators keep raising eyebrows about these industries.
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