Mobile phone operators market in India is an example of

Correct — C, Oligopoly. An oligopoly is a market with a small number of sellers, each large enough that its pricing changes what the others do, and protected by high barriers to entry. Indian mobile telephony fits every part of that description. A handful of operators serve the whole country, spectrum has to be bought at auction and networks cost enormous sums to build, so entry is closed to all but the very large. The tell-tale sign is interdependence — when one operator cuts tariffs the others follow within weeks, which is behaviour that neither a monopolist nor a firm in a crowd of small sellers would show.

• (a)Monopoly — A monopoly has a single seller and no close substitute. Indian mobile telephony has several operators competing for the same subscriber, and a subscriber can now carry a number from one to another.
• (b)Monopolistic Competition — That structure needs many sellers with differentiated products and easy entry — soaps, restaurants and toothpaste are the standard examples. Telecom fails the entry test decisively, since spectrum is auctioned and networks are enormously costly.
• (d)Perfect Competition — Requires very many sellers, an identical product and no seller able to influence price. Mobile operators set their own tariffs and each is large enough that its move shifts the market, which is the opposite of price-taking.

Market structures are classified by the number of sellers, whether the product is identical or differentiated, and how hard it is to enter. Perfect competition has very many sellers and an identical product; monopolistic competition has many sellers and differentiated products; oligopoly has few sellers and interdependent decisions; monopoly has one. Entry barriers do most of the work in separating the last two from the first two.

The distinguishing feature of oligopoly is strategic behaviour, and it is the reason the structure has no single price theory the way the others do. Each firm has to guess what its rivals will do before it acts, which is why oligopoly is the branch of the subject where game theory earns its place, and why the kinked demand curve is taught as one attempt to explain why oligopoly prices are sticky. Indian telecom illustrates the other feature too — oligopolies tend to consolidate. As of the 2020 exam a market that had carried a dozen operators a few years earlier had settled into three large private networks alongside the state-owned one, and it has stayed at roughly that number since. Regulation matters here as much as economics, which is why the sector has a statutory regulator in the Telecom Regulatory Authority of India.

• An oligopoly has few sellers, high barriers to entry, and firms whose decisions depend on what rivals are expected to do.
• Spectrum auctions and the cost of building a network are the barriers that keep Indian telecom an oligopoly.
• Monopolistic competition needs many sellers and easy entry, with the product differentiated by brand or quality.
• Perfect competition requires very many sellers of an identical product, all of them price-takers.
• Price rigidity and the kinked demand curve are the standard analytical devices for oligopoly pricing.

• Counting sellers alone; monopolistic competition and oligopoly differ mainly on entry, not on number.
• Calling a market monopolistic because one firm is much larger than the rest.
• Treating a differentiated product as proof of monopolistic competition — oligopolists differentiate too.

Classify-the-market items give a real industry and expect the structure. Ask how many can realistically enter, not how many are currently selling.

• practice — not a real PYQ

  Which one of the following is the best example of a monopoly in India?

  • (a)The market for soaps
  • (b)Indian Railways in passenger rail transport
  • (c)Mobile telephony
  • (d)Retail vegetable markets

  Answer(b) Indian Railways in passenger rail transport — a single supplier with no close substitute on the network.

• practice — not a real PYQ

  The interdependence of pricing decisions among firms is the defining feature of

  • (a)perfect competition
  • (b)monopolistic competition
  • (c)oligopoly
  • (d)monopoly

  Answer(c) oligopoly — with few enough sellers, each firm's move visibly changes the others' position.