Index

Mental Models

Prisoner's Dilemma

A game where two rational actors might not cooperate even though mutual cooperation produces a better outcome for both.

The prisoner's dilemma reveals why cooperation is hard even when both parties would benefit, and why trust, reputation, and repeated interaction change the calculus.

Core question

Is the structure of this interaction making cooperation irrational even though both sides would benefit?

Example

Two competing vendors could both maintain quality standards, but each is tempted to cut corners for short-term savings. If both defect, the entire market suffers from lower trust.

How to apply

  1. 1.Identify whether the interaction has a prisoner's dilemma structure.
  2. 2.Determine if the game is one-shot or repeated — repeated games favor cooperation.
  3. 3.Build mechanisms for trust: transparency, reputation systems, or enforceable agreements.
  4. 4.Use tit-for-tat or generous reciprocity strategies in repeated interactions.

Pitfalls

  • ·Always cooperating with persistent defectors — that is exploitable, not virtuous.
  • ·Treating a repeated game as one-shot and defecting unnecessarily.
  • ·Over-applying the dilemma framework when the real dynamic is simpler.

Questions

What is the best strategy in a repeated prisoner's dilemma?

Tit-for-tat (cooperate first, then mirror the other's last move) performs well. Generous tit-for-tat, which occasionally forgives defection, does even better in noisy environments.

How does the prisoner's dilemma appear in business?

Price wars, arms races in features, and underinvestment in industry standards are all prisoner's dilemma dynamics where individual incentives undermine collective benefit.

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