Crowd Folly is groups sometimes behave as foolishly as the worst individuals. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0206, within the Social family. The core principle: groups sometimes behave as foolishly as the worst individuals. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
Scientific Definition
Groups sometimes behave as foolishly as the worst individuals.
Plain-English Definition
Groups sometimes behave as foolishly as the worst individuals.
Feynman Explanation
A thousand people can be wrong with breathtaking confidence.
Core Principle
Groups sometimes behave as foolishly as the worst individuals.
Mechanisms
Pending editorial review.
Groups sometimes behave as foolishly as the worst individuals.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Boards and teams can reinforce collective delusion.
Inputs (Triggers)
Pending editorial review.
Outputs (Behaviors)
Pending editorial review.
Behavioral Signature
A thousand people can be wrong with breathtaking confidence.
Examples
- A mob of investors drives a stock to irrational heights.
- Boards and teams can reinforce collective delusion.
Pending editorial review.
Original analysis from The Incentives Lab — how this element behaves inside real payoff structures.
Why this element matters to incentive design
This element is common enough to feel like human nature and specific enough to be engineered around. The mechanism underneath it is straightforward: groups sometimes behave as foolishly as the worst individuals. You can recognize it in the field by its signature: a thousand people can be wrong with breathtaking confidence. Every element in the Cognition dimension changes the perceived payoff of an action before the action happens, which is exactly where incentive design has leverage.
How it gets exploited
Left undesigned, boards and teams can reinforce collective delusion. It is amplified whenever boards and teams can reinforce collective delusion. Inside organizations that shows up as boards and teams can reinforce collective delusion. The pattern is the same one Goodhart's Law describes: the measurable proxy attracts the effort, and the purpose behind it quietly loses funding.
How the Lab designs around it
The redesign move is to appoint independent critics and reward dissent. The leverage is not in explaining the behavior to people. It is in changing what the behavior earns.
Famous Experiments
Pending editorial review.
Design Principles
- Appoint independent critics and reward dissent.
Measurement Approaches
Pending editorial review.
Evidence
Pending editorial review.
Pending editorial review.
The Perverse Incentive Lens™
How this behavior is exploited — and how to redesign around it.
- Appoint independent critics and reward dissent.
Pending editorial review.
Pending editorial review.
Interactive Mini Network
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Knowledge Graph Neighbors
Auto-linked to the rest of the Human Behavior Taxonomy by family, domain, dimension, and shared keywords.
Influencing the beliefs and actions of a crowd through psychological techniques.
A group decides on a course of action that nobody actually wants, because everyone assumes others prefer it.
Power tends to corrupt, and absolute power corrupts absolutely.
We attribute our own actions to situations but others' actions to their character.
We favor people who are similar to us or who like us.
Sacrificing for others without expecting a personal reward.
Masking the sponsors of a message to make it appear grassroots.
Disagreement grows more extreme as the parties think more about the issue.
Systematic errors in explaining the causes of behavior — yours or others'.
We accept vague, general statements as personally meaningful.
Adding the word 'because' (with any reason) increases compliance dramatically.
Behaviors spread through groups via observation and imitation.
Where Crowd Folly is cited in the corpus
Essays, field guides, and diagnostics from The Incentives Lab that apply this element.
- EssayGoodhart's Law in the Real World
How measurable proxies capture judgment.
- EssayThe Perverse Incentives Hiding in Your KPIs
Cognitive shortcuts turned into scorecards.
- EssayAI Agents Inherit Your Incentives
How this element propagates into automated systems.
- ReferenceThe Periodic Table of Human Behavior
The full 1,267-element map this page belongs to.
- ReferenceThe incentive glossary
Definitions for every mental model, bias, and fallacy in the corpus.
Questions about Crowd Folly
- What is Crowd Folly?
- Crowd Folly is groups sometimes behave as foolishly as the worst individuals. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0206, within the Social family. The core principle: groups sometimes behave as foolishly as the worst individuals. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
- What is an example of Crowd Folly?
- Boards and teams can reinforce collective delusion. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0206).
- How is Crowd Folly exploited?
- Boards and teams can reinforce collective delusion.
- How do you design around Crowd Folly?
- Appoint independent critics and reward dissent.
- Which behavioral dimension does Crowd Folly belong to?
- Crowd Folly is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Social", class "Mental Model". Its permanent identifier is HBT-COG-0206 and its evidence grade is B.