Appeal to Ignorance is claiming something is true because it hasn't been proven false (or vice versa). It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0046, within the Relevance Fallacy family. The core principle: claiming something is true because it hasn't been proven false (or vice versa). 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
Claiming something is true because it hasn't been proven false (or vice versa).
Plain-English Definition
Claiming something is true because it hasn't been proven false (or vice versa).
Feynman Explanation
'We have no evidence of harm.' (Because no one measured.)
Core Principle
Claiming something is true because it hasn't been proven false (or vice versa).
Mechanisms
Claiming something is true because it hasn't been proven false (or vice versa).
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Inputs (Triggers)
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Outputs (Behaviors)
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Behavioral Signature
'We have no evidence of harm.' (Because no one measured.)
Examples
- 'No one's complained, so we must be doing fine.'
- Silence misread as endorsement.
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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
When this element shows up in a diagnostic, the instinct is to train people out of it. Training rarely moves it. The mechanism underneath it is straightforward: claiming something is true because it hasn't been proven false (or vice versa). You can recognize it in the field by its signature: 'We have no evidence of harm.' (Because no one measured.). 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, silence misread as endorsement. It is amplified whenever silence misread as endorsement. Inside organizations that shows up as silence misread as endorsement. 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
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.
It's true because authority says so.
Common sense says so, therefore it's true.
Believing something is true because of the consequences of its truth.
If it's 'natural,' it's good.
It's better because it's newer.
It's right because it's how we've always done it.
Attacking the person rather than the argument.
I can't believe it; therefore it isn't true.
Saying it enough times until it sounds true.
It's true because many believe it.
Asking the other side to disprove an unsupported claim.
Concluding that because an argument contained a fallacy, its conclusion must be false.
Where Appeal to Ignorance 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.
- CourseIncentives 101
The free ten-part primer on reading a payoff structure.
- ReferenceThe Periodic Table of Human Behavior
The full 1,267-element map this page belongs to.
Questions about Appeal to Ignorance
- What is Appeal to Ignorance?
- Appeal to Ignorance is claiming something is true because it hasn't been proven false (or vice versa). It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0046, within the Relevance Fallacy family. The core principle: claiming something is true because it hasn't been proven false (or vice versa). 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 Appeal to Ignorance?
- Silence misread as endorsement. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0046).
- How is Appeal to Ignorance exploited?
- Silence misread as endorsement.
- How do you design around Appeal to Ignorance?
- 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 Appeal to Ignorance belong to?
- Appeal to Ignorance is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Relevance Fallacy", class "Logical Fallacy". Its permanent identifier is HBT-COG-0046 and its evidence grade is B.