Existential Fallacy is assuming something exists because we can name or define it. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0283, within the Reasoning family. The core principle: assuming something exists because we can name or define it. 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
Assuming something exists because we can name or define it.
Plain-English Definition
Assuming something exists because we can name or define it.
Feynman Explanation
The map insists on the territory.
Core Principle
Assuming something exists because we can name or define it.
Mechanisms
Pending editorial review.
Assuming something exists because we can name or define it.
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Many strategic plans contain non-existent entities.
Inputs (Triggers)
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Outputs (Behaviors)
Pending editorial review.
Behavioral Signature
The map insists on the territory.
Examples
- Strategy documents that reference 'the customer' as if the abstraction is a person.
- Many strategic plans contain non-existent entities.
Pending editorial review.
Original analysis from The Incentives Lab — how this element behaves inside real payoff structures.
Why this element matters to incentive design
The mistake with this element is treating it as irrationality. It is almost always a rational response to a payoff nobody wrote down. The mechanism underneath it is straightforward: assuming something exists because we can name or define it. You can recognize it in the field by its signature: the map insists on the territory. 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, many strategic plans contain non-existent entities. It is amplified whenever many strategic plans contain non-existent entities. Inside organizations that shows up as many strategic plans contain non-existent entities. 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 trace every category in a plan to actual, observable instances. Watch for it at the boundaries: handoffs, promotions, incident reviews, and budget cycles are where this element gets its power.
Famous Experiments
Pending editorial review.
Design Principles
- Trace every category in a plan to actual, observable instances.
Measurement Approaches
Pending editorial review.
Evidence
Pending editorial review.
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The Perverse Incentive Lens™
How this behavior is exploited — and how to redesign around it.
- Trace every category in a plan to actual, observable instances.
Pending editorial review.
Pending editorial review.
Interactive Mini Network
Click any neighbor to re-center the graph and follow the threads of connection.
Knowledge Graph Neighbors
Auto-linked to the rest of the Human Behavior Taxonomy by family, domain, dimension, and shared keywords.
Using personal stories or isolated examples instead of evidence.
Concluding that a claim is false because the argument for it is flawed.
Assuming qualities of one thing transfer to another because they are associated.
Drawing conclusions about individuals from group-level data.
Relying solely on metrics that are easily quantified while ignoring what matters.
Cherry-picking data to fit a pattern after the fact.
Deriving general rules from specific examples; the leap from instance to concept.
The brain evolved to reason adaptively, not always truthfully, to reduce the cost of errors.
We solve problems by adding, even when subtracting would be better.
Assuming that if one option is true, another must be false, when both can be true.
Presuming a purposeful actor behind events that may have no actor at all.
What cannot be settled by experiment is not worth debating.
Where Existential 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.
- 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 Existential Fallacy
- What is Existential Fallacy?
- Existential Fallacy is assuming something exists because we can name or define it. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0283, within the Reasoning family. The core principle: assuming something exists because we can name or define it. 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 Existential Fallacy?
- Many strategic plans contain non-existent entities. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0283).
- How is Existential Fallacy exploited?
- Many strategic plans contain non-existent entities.
- How do you design around Existential Fallacy?
- Trace every category in a plan to actual, observable instances.
- Which behavioral dimension does Existential Fallacy belong to?
- Existential Fallacy is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Reasoning", class "Mental Model". Its permanent identifier is HBT-COG-0283 and its evidence grade is B.