What is Oligopoly?
An oligopoly is a market structure where a small number of large firms dominate the industry. These firms compete with each other but have significant power over supply and pricing.
An oligopoly is a market dominated by a few large firms that control most of the industry's output. Barriers to entry are high, and firms often behave interdependently.
- •Few large firms
- •High barriers to entry
- •Similar products
- •Price leadership or competition
- •Many small firms
- •Low barriers
- •Identical products
- •Price takers
Step-by-step worked examples
The car industry in the US is dominated by Ford, GM, Tesla, and a few others. Is this an oligopoly?
Check: Few large firms? Yes (3-4 major producers). High barriers to entry? Yes (billions in capital needed). Do they control pricing? Yes (can influence prices). Conclusion: Yes, this is an oligopoly.
Airlines like United, American, and Delta control US domestic flights. What market structure is this?
Few firms? Yes, 3-4 dominate. High entry barriers? Yes (planes, routes, landing slots). Interdependent? Yes, they match each other's prices. This is an oligopoly.
A small town has 50 restaurants, none dominant. Is this an oligopoly?
Few large firms? No. Low entry barriers? Yes (anyone can open). This is monopolistic competition or perfect competition, NOT oligopoly.
Flashcards
Quick quiz
Q1.Which is an oligopoly?
Q2.Oligopolists are interdependent. What does this mean?
Q3.Why are entry barriers high in oligopolies?
Q4.Price leadership in oligopoly means…
The full card deck, worked steps and AI-tutor support for “What is Oligopoly?” are in Notek — study by hand before your exam.
Common mistakes
Oligopoly = monopoly. — Correct: Oligopoly = few competing firms; monopoly = one firm with no rivals.
All oligopolies collude. — Correct: Some compete fiercely (e.g., airlines price wars); collusion is illegal.
Oligopoly needs 20+ firms. — Correct: Typically 3–8 large firms controlling 50–90%; few dominate.
Oligopolies always raise prices. — Correct: They may cut prices to gain market share, but have more power than competitors.
FAQ
What is the definition of oligopoly?
A market with a few large firms controlling most of the industry's output and pricing.
What is the difference between oligopoly and monopoly?
Monopoly = one firm with no rivals. Oligopoly = few firms competing with each other.
Are oligopolies illegal?
No, but cartels (firms fixing prices) are illegal. Oligopoly itself is legal.
Is the car industry an oligopoly?
Yes — 3–4 firms (GM, Ford, Tesla) dominate US car sales.