Duopoly

noun (countable)

/djuːˈɒpəli/

A market structure in which only two firms dominate the supply of a good or service, giving each seller significant market power while still requiring strategic interaction — each firm's pricing and output decisions depend on the other's response. Classic models include Cournot duopoly (quantity competition) and Bertrand duopoly (price competition). In India, the telecom sector post-consolidation is effectively a duopoly between Reliance Jio and Bharti Airtel (with BSNL as a marginal state player), raising concerns about pricing power, reduced competition, and consumer welfare.

✍️ Usage in a UPSC answer

India's telecom sector, having consolidated from over a dozen operators to a functional Jio-Airtel duopoly by 2024, presents a regulatory challenge for TRAI in balancing carrier profitability needed for 5G investment against consumer interest in competitive tariffs.

Synonyms

two-firm marketbilateral monopoly (partial)twin-seller market

Antonyms

monopolyperfect competitionoligopolyfragmented market

🌱 Word Family

duopolist (noun), duopolistic (adjective), oligopoly (related noun), monopoly (noun), duopsony (noun, two buyers)

🔡 Root

Latin/Greek duo = two + Greek pōlein = to sell; modelled on monopoly

📜 Etymology

Coined by analogy with monopoly (Greek monos = one + polein = to sell), replacing mono- with duo- (Latin/Greek for two). The term gained formal economic analysis in Antoine Augustin Cournot's Recherches sur les principes mathématiques de la théorie des richesses (1838), which presented the first mathematical model of duopolistic competition.

🧠 Memory Hook

DUO-POLY: DUO means TWO (like a music duo) and POLY relates to selling. Two sellers playing a market game — like two chess masters who must each anticipate the other's every move.

💰 Indian Economy 📖 Seen in: Indian Economy — Growth, Planning & De...

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