A market dominated by a small number of large sellers, whose decisions on price and output are interdependent.

From Greek ''oligoi'' (few) and ''polein'' (to sell).

market concentration duopoly few sellers dominant bloc
perfect competition monopoly fragmentation open market
"The telecom sector had consolidated into an oligopoly of three private players after years of tariff wars."

Relevant to GS Paper 3 on market structures and competition policy. Use it to analyse concentration in telecom, aviation, and digital platforms, and the role of the Competition Commission of India in preventing abuse of dominance and predatory pricing.

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