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Prisoner's dilemma

In game theory, the prisoner's dilemma is a thought experiment involving two rational agents, each of whom can either cooperate for mutual benefit or betray their partner ("defect") for individual gain.

Version
v1 · 2026-09-28 · History
Domain-specific #
11489
Domain group
Social Sciences
Origin domain
Economics & Finance
Subdomain
Game Theory → Economics & Finance

Core Idea

Prisoner's dilemma is treated here as the recurring crossdomainmodelsstructuresrepresentations identity summarized by this source-grounded definition: In game theory, the prisoner's dilemma is a thought experiment involving two rational agents, each of whom can either cooperate for mutual benefit or betray their partner ("defect") for individual gain. In game theory, the prisoner's dilemma is a thought experiment involving two rational agents, each of whom can either cooperate for mutual benefit or betray their partner ("defect") for individual gain.

Scope of Application

  • General strategy. According to a 2019 experimental study in the American Economic Review that tested what strategies real-life subjects used in iterated prisoner's dilemma situations with perfect monitoring, the majority of chosen strategies.

  • Axelrod's tournament and successful strategy conditions. He used this to show a possible mechanism for the evolution of altruistic behavior from mechanisms that are initially purely selfish, by natural selection.

  • Axelrod's tournament and successful strategy conditions. This allows for occasional recovery from getting trapped in a cycle of defections.

  • Stochastic iterated prisoner's dilemma. P is a function of the outcomes of their previous encounters or some subset thereof.

  • Stochastic iterated prisoner's dilemma. If P is a function of only their most recent n encounters, it is called a "memory-n" strategy.

Clarity

A clear use of Prisoner's dilemma names the carrier, the operative relation, and the conditions under which the source treats the identity as present. The minimal definition is In game theory, the prisoner's dilemma is a thought experiment involving two rational agents, each of whom can either cooperate for mutual benefit or betray their partner ("defect") for individual gain.

Manages Complexity

Prisoner's dilemma compresses multiple crossdomainmodelsstructuresrepresentations details into a stable diagnostic relation. The source shows both the central mechanism—nevertheless, the optimal amount of advertising by one firm depends on how much advertising the other undertakes.—and the practical consequence—in addition to the general form above, the iterative version also requires that , to prevent alternating cooperation and defection giving a greater reward than mutual cooperation.

Abstract Reasoning

  1. Type the carrier. Identify the crossdomainmodelsstructuresrepresentations entities to which the claim applies.
  2. State the relation. Use the source-grounded identity: In game theory, the prisoner's dilemma is a thought experiment involving two rational agents, each of whom can either cooperate for mutual benefit or betray their partner ("defect") for individual gain.
  3. Check operation and conditions. Each is informed that the other prisoner is being offered the very same deal.
  4. Demand recognition evidence.

Knowledge Transfer

Within the home domain. Knowledge about Prisoner's dilemma transfers literally when a new case preserves the same carrier type, relation, and recognition test. According to a 2019 experimental study in the American Economic Review that tested what strategies real-life subjects used in iterated prisoner's dilemma situations with perfect monitoring, the majority of chosen strategies were always to defect, tit-for-tat, and grim trigger. He used this to show a possible mechanism for the evolution of altruistic behavior from mechanisms that are initially purely selfish, by natural selection. Beyond the home domain. No canonical parent is asserted for Prisoner's dilemma.

Relationships to Other Abstractions

Local relationship map for Prisoner's dilemmaParents appear above the current abstraction, mutual partners to the right, and children below. Node labels state whether each abstraction is prime or domain-specific; colors identify relation types.Prisoner's dilemmaDOMAINPrime abstraction: Dilemma — is a kind ofDilemmaPRIMEPrime abstraction: Thought Experiment — is a kind ofThoughtExperimentPRIME

Current abstraction Prisoner's dilemma Domain-specific

Parents (2) — more general patterns this builds on

  • Prisoner's dilemma is a kind of Dilemma Prime

    The prisoner's dilemma is a dilemma in which individually dominant defection produces a worse joint result.

  • Prisoner's dilemma is a kind of Thought Experiment Prime

    It is a thought experiment used to reason about cooperation and rational choice.

Hierarchy paths (7) — routes to 7 parentless roots

Neighborhood in Abstraction Space

Prisoner's dilemma sits in a crowded region of the domain-specific corpus (32nd percentile for distinctiveness): several abstractions share nearly its structure, so a description that fits it tends to fit its neighbors too.

Family — Political & Strategic Game Models (11 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-10-08