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Market structures

In this chapter: Perfect competition, monopoly, oligopoly · Pricing under each structure

~3 min readLayer 4 · Professional CertificationsFree

Four market structures: Perfect competition, Monopolistic competition, Oligopoly, Monopoly. Each has different pricing dynamics, profitability, capital intensity.

Foundation

Perfect competition: many firms, identical product, free entry, price-takers. P = MC. Long-run zero economic profit. Monopolistic competition: many firms, differentiated products. Restaurants, hair salons. Profits possible short-run; eroded by entry long-run. Oligopoly: few firms, interdependent decisions. Telecom, aviation in India. Game-theoretic interactions. Monopoly: one firm, no substitutes, barriers to entry. Indian Railways historically.

Deep Dive

Pricing under each: • Perfect competition: P = MR = MC • Monopolistic competition: P > MC (markup), but limited by entry • Oligopoly: kinked demand curve; cartels possible (OPEC); collapsed quickly without enforcement • Monopoly: P > MR > MC (downward demand curve) Indian sector applications: • Telecom (post-Jio 2016): high rivalry, low margins • FMCG: monopolistic competition with brand loyalty, high margins • IT services: moderate rivalry • Banking: regulated, moderate margins

Advanced

Concentration metrics: HHI (Herfindahl-Hirschman Index) = Σ(market share)². • HHI > 2500: high concentration, anti-competitive • HHI < 1500: competitive Indian PSU banks consolidation post-2017 raised banking HHI sharply. Post-mergers, fewer but larger PSU banks. Market structure dynamics: • Jio entry telecom 2016: oligopoly disrupted, prices fell 70%, competitors lost ₹'000s cr • Reliance retail expansion: changing retail structure • Adani in airports: concentration shifting For CFA exam: pair structure with profit margins, capital intensity, pricing power.

Regulatory references
  • Competition Commission of India (CCI)
  • TRAI for telecom
  • CFA Institute curriculum
Common mistakes & pitfalls
  • Confusing market structures.
  • Not adjusting margin analysis for structure type.
  • Static thinking about industry structure.

Frequently asked

Is HHI calculated for India?
Yes, by Competition Commission of India (CCI). Industry-specific. Pre-merger reviews use HHI to assess anti-competitive concerns.
Why oligopolies often unstable?
Each firm has incentive to undercut others. Cartels collapse without enforcement. Game theory predicts. Indian telecom post-Jio is example.

Practice questions

Click each question to reveal the answer and explanation.

Q 1
Perfect competition implies:
  1. (a)One firm controls market
  2. (b)Many firms, identical products, P = MC
  3. (c)Few firms with differentiated products
  4. (d)No firms
Correct: (b) Many firms, identical products, P = MC
Perfect competition: many firms, identical products, P = MC = MR. Long-run zero economic profit.
Q 2
HHI > 2500 means:
  1. (a)Highly competitive
  2. (b)Highly concentrated; anti-competitive risk
  3. (c)Random
  4. (d)Standard market
Correct: (b) Highly concentrated; anti-competitive risk
HHI > 2500: highly concentrated. Mergers in such industries face anti-competitive scrutiny.
Q 3
Indian telecom post-Jio (2016+):
  1. (a)Highly competitive
  2. (b)Oligopoly disrupted; consolidated to 3 major operators with rising concentration
  3. (c)Stable monopoly
  4. (d)Perfect competition
Correct: (b) Oligopoly disrupted; consolidated to 3 major operators with rising concentration
Jio disrupted oligopoly via aggressive pricing. Forced consolidation. Now 3 major operators (concentrated).
Q 4
Monopolistic competition:
  1. (a)Many firms, identical products
  2. (b)Many firms, differentiated products (restaurants, salons)
  3. (c)Single firm
  4. (d)Few firms
Correct: (b) Many firms, differentiated products (restaurants, salons)
Monopolistic competition: many firms with differentiated products. Brand loyalty. Examples: restaurants, salons, FMCG.
Q 5
Cartels in oligopoly typically:
  1. (a)Stable forever
  2. (b)Collapse quickly without enforcement
  3. (c)Maintain prices indefinitely
  4. (d)Always government-supported
Correct: (b) Collapse quickly without enforcement
Cartels collapse: each firm has incentive to undercut. Without enforcement (legal contract, state action), they don't last.
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