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The Incentives Lab
HBT-COG-0177 · Dimension COG · Cognition

Conjunction Fallacy

Believing a specific scenario is more likely than its more general one.

Probability Bias·Cognitive Bias·Grade B·draft· enriching…

Scientific Definition

Believing a specific scenario is more likely than its more general one.

Plain-English Definition

Believing a specific scenario is more likely than its more general one.

Feynman Explanation

'Linda is a feminist bank teller' feels more likely than just 'Linda is a bank teller.' It can't be.

Core Principle

Believing a specific scenario is more likely than its more general one.

Mechanisms

Psychological

Believing a specific scenario is more likely than its more general one.

Behavioral Economic

Pending editorial review.

Neurological

Pending editorial review.

Evolutionary

Pending editorial review.

Sociological

Pending editorial review.

Computational

Pending editorial review.

Systems

Pending editorial review.

Inputs (Triggers)

Pending editorial review.

Outputs (Behaviors)

Pending editorial review.

Behavioral Signature

'Linda is a feminist bank teller' feels more likely than just 'Linda is a bank teller.' It can't be.

Examples

Everyday
  • Strategies sold as detailed scenarios that are necessarily less likely than the general bet.
Modern (Organizational)
  • Forecasts that gain credibility by gaining unnecessary detail.
Historical

Pending editorial review.

Famous Experiments

Pending editorial review.

Design Principles

  • Decompose claims into base probabilities.

Measurement Approaches

Pending editorial review.

Evidence

Evidence Grade
B (A strongest → E speculative)
Replication
★★★☆☆
Intervention Confidence
3 / 5
Consensus
Pending editorial review (HBT v1.0 auto-seed).
Limitations
Pending editorial review (HBT v1.0 auto-seed).
Open Research Questions

Pending editorial review.

Primary References

Pending editorial review.

Signature Section

The Perverse Incentive Lens™

How this behavior is exploited — and how to redesign around it.

Exploitation
AI predictions trusted more when narratively rich; that's the wrong signal.
Amplifying Incentives
Forecasts that gain credibility by gaining unnecessary detail.
Org Failure Modes
Forecasts that gain credibility by gaining unnecessary detail.
Societal Failure Modes
Pending editorial review (HBT v1.0 auto-seed).
Ethical Considerations
Pending editorial review (HBT v1.0 auto-seed).
Redesign Strategies
Decompose claims into base probabilities.
Diagnostic Questions
  • Decompose claims into base probabilities.
Warning Signs

Pending editorial review.

Red Flags

Pending editorial review.

Intervention Playbook
Individual
Decompose claims into base probabilities.
Team
Pending editorial review (HBT v1.0 auto-seed).
Organization
Pending editorial review (HBT v1.0 auto-seed).
Policy
Pending editorial review (HBT v1.0 auto-seed).
AI Implications
Detection
AI predictions trusted more when narratively rich; that's the wrong signal.
Measurement
Pending editorial review (HBT v1.0 auto-seed).
Mitigation
Pending editorial review (HBT v1.0 auto-seed).
Responsible Use
Pending editorial review (HBT v1.0 auto-seed).

Interactive Mini Network

Click any neighbor to re-center the graph and follow the threads of connection.

HBT-COG-0177 · COG
Conjunction Fallacy
CFAAAmbiguity AversionBRBase Rate NeglectGFGambler's FallacyHFHot-Hand FallacyOBOptimism BiasPBPessimism BiasPIPessimism in Forecas…PFPlanning FallacyZBZero-Risk BiasABAction Bias

Knowledge Graph Neighbors

Version History

v1.1.0 · 2026-06-28Initial auto-seed from corpus.