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What is game theory?

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Quick answer

Game theory is the mathematical study of strategic decision-making — how rational players choose actions when the outcome depends on what others do. It's used in economics, biology, politics, and AI. It models situations where each player's best move depends on others' moves.

Key things to understand

  1. It models situations where each player's best move depends on others' moves.
  2. A 'Nash equilibrium' is a state where no one can do better by changing alone.
  3. The Prisoner's Dilemma shows how individual incentives can lead to worse group outcomes.
  4. It explains competition, cooperation, auctions, and negotiation.

People also ask

What is the Prisoner's Dilemma?
A classic game where two players, each acting in self-interest, end up worse off than if they had cooperated.
What is a Nash equilibrium?
A set of choices where no player can improve their outcome by changing their own strategy alone.
Where is game theory used?
Economics, business strategy, evolutionary biology, politics, and AI.