Definition
Game Theory in Markets
Game theory studies strategic decision-making among interdependent players, used to model oligopoly pricing, cartels, auctions and central-bank credibility.
When a few firms' decisions depend on each other, game theory predicts outcomes. The famous prisoner's dilemma explains why cartels are unstable: each member is tempted to cheat, leading to price wars like India's telecom battles.
Game theory also informs spectrum auctions, OPEC output decisions and how central banks build credibility so markets believe their inflation commitments. The Nash equilibrium, where no player gains by changing strategy alone, is the central solution concept.
Related terms
- OPECOPEC is the Organization of the Petroleum Exporting Countries, a cartel of major oil producers that coordinates output to influence global crude prices.
- MonopolyA monopoly is a market with a single seller and no close substitutes, giving that firm power to set prices above competitive levels and restrict output.
- OligopolyAn oligopoly is a market dominated by a few large firms whose decisions are interdependent, often leading to price rigidity, tacit coordination or fierce competition.
- Nash EquilibriumA Nash equilibrium is a state in a strategic game where no player can improve their outcome by unilaterally changing strategy, given the others' choices.
Plain-English explainer from The Dispatch Investors Encyclopedia. General information, not financial advice.