Oligopoly – Definition & Examples

Definition: A market structure dominated by a small number of large firms whose decisions affect each other.

Detailed Explanation

In oligopolies, firms must consider competitors' reactions to their pricing and production decisions—this is called strategic interdependence. Oligopolies often have high barriers to entry, may collude to act like monopolies, or compete fiercely. Game theory helps analyze oligopoly behavior. Industries often become oligopolies due to economies of scale.

Real-World Example

The smartphone market is an oligopoly—Apple, Samsung, and a few others dominate. When Apple raises prices, Samsung must decide whether to follow. Airlines, auto manufacturers, and streaming services are similar.

AP Economics Relevance

Oligopoly connects to game theory concepts on AP Micro. You'll analyze strategic behavior, collusion, and the kinked demand curve model.

Category: Microeconomics

How this guide is built

EconArena pairs each definition with exam relevance, a real-world example, a quick diagnostic, and related games or tools so students can move from reading the concept to practicing it.

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How to Remember It

A market structure dominated by a small number of large firms whose decisions affect each other. A useful definition should do more than name the concept. Try to describe Oligopoly – Definition & Examples in your own words, give one real-world example, and name one situation where confusing it with a related term would lead to the wrong answer. That habit is especially helpful for AP, IB, and introductory college economics.

Where It Shows Up

This term can appear in graphs, multiple-choice questions, short-answer explanations, and everyday economic news. Use the linked practice pages and games to see how the idea behaves when assumptions change, incentives shift, or a policy choice affects consumers, firms, workers, or governments.