Division Fallacy is what's true of the whole is assumed true of the parts. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0248, within the Definition Fallacy family. The core principle: what's true of the whole is assumed true of the parts. 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
What's true of the whole is assumed true of the parts.
Plain-English Definition
What's true of the whole is assumed true of the parts.
Feynman Explanation
The company is innovative. Therefore every meeting is.
Core Principle
What's true of the whole is assumed true of the parts.
Mechanisms
What's true of the whole is assumed true of the parts.
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Inputs (Triggers)
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Outputs (Behaviors)
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Behavioral Signature
The company is innovative. Therefore every meeting is.
Examples
- Brand attributes mistakenly attributed to every employee or product.
- Brand narrative writing checks the org can't cash.
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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: what's true of the whole is assumed true of the parts. You can recognize it in the field by its signature: the company is innovative. Therefore every meeting is. 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, brand narrative writing checks the org can't cash. It is amplified whenever brand narrative writing checks the org can't cash. Inside organizations that shows up as brand narrative writing checks the org can't cash. 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 make the desired behavior observable, remove whatever currently pays for its opposite, and attach the reward to the behavior rather than to the noisy outcome downstream of it. The leverage is not in explaining the behavior to people. It is in changing what the behavior earns.
Famous Experiments
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Design Principles
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Measurement Approaches
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Evidence
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The Perverse Incentive Lens™
How this behavior is exploited — and how to redesign around it.
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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.
Assuming the conclusion in the premise.
The conclusion is hidden inside the premise.
What's true of the parts is assumed true of the whole.
Because there's no sharp line, no distinction exists.
Quietly redefining a term mid-argument.
Constraining the option set to bias the decision.
Insisting on a word's original meaning over its current one.
Treating two things as comparable when they're not.
Assuming the truth must lie between two extremes.
Deriving 'is' from 'ought.'
Changing success criteria whenever the prior criteria are met.
Deriving 'ought' from 'is.'
Where Division Fallacy 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.
- ReferenceThe incentive glossary
Definitions for every mental model, bias, and fallacy in the corpus.
- ReferenceThe Periodic Table of Human Behavior
The full 1,267-element map this page belongs to.
Questions about Division Fallacy
- What is Division Fallacy?
- Division Fallacy is what's true of the whole is assumed true of the parts. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0248, within the Definition Fallacy family. The core principle: what's true of the whole is assumed true of the parts. 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 Division Fallacy?
- Brand narrative writing checks the org can't cash. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0248).
- How is Division Fallacy exploited?
- Brand narrative writing checks the org can't cash.
- How do you design around Division Fallacy?
- Name the behavior you want in observable terms, remove what currently pays for the opposite, attach the reward to the behavior rather than a lagging proxy, and publish how you will detect gaming.
- Which behavioral dimension does Division Fallacy belong to?
- Division Fallacy is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Definition Fallacy", class "Logical Fallacy". Its permanent identifier is HBT-COG-0248 and its evidence grade is B.