Affirming the Consequent is if A then B; B happened; therefore A. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0020, within the Causation Fallacy family. The core principle: if A then B; B happened; therefore A. 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
If A then B; B happened; therefore A.
Plain-English Definition
If A then B; B happened; therefore A.
Feynman Explanation
Top performers love the bonus. So the bonus makes top performers. (No.)
Core Principle
If A then B; B happened; therefore A.
Mechanisms
If A then B; B happened; therefore A.
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Inputs (Triggers)
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Outputs (Behaviors)
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Behavioral Signature
Top performers love the bonus. So the bonus makes top performers. (No.)
Examples
- Promoting bonus expansion because high performers always cash theirs.
- Correlation upgraded to causation in performance management.
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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: if A then B; B happened; therefore A. You can recognize it in the field by its signature: top performers love the bonus. So the bonus makes top performers. (No.). 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, correlation upgraded to causation in performance management. It is amplified whenever correlation upgraded to causation in performance management. Inside organizations that shows up as correlation upgraded to causation in performance management. 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.
Reasoning backward from outcomes to motives.
Treating two things that move together as one causing the other.
With this, therefore because of this.
If A then B; not A; therefore not B.
Stacking so many tenuous links that the conclusion sounds clever.
B followed A, therefore A caused B.
Assuming one cause where many are at play.
A small step inevitably leads to extreme consequences.
Small step → catastrophic outcome, without the intermediate causal links.
Attacking the person rather than the argument.
A single story used as proof of a general claim.
It's true because authority says so.
Where Affirming the Consequent 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 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 Affirming the Consequent
- What is Affirming the Consequent?
- Affirming the Consequent is if A then B; B happened; therefore A. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0020, within the Causation Fallacy family. The core principle: if A then B; B happened; therefore A. 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 Affirming the Consequent?
- Correlation upgraded to causation in performance management. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0020).
- How is Affirming the Consequent exploited?
- Correlation upgraded to causation in performance management.
- How do you design around Affirming the Consequent?
- 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 Affirming the Consequent belong to?
- Affirming the Consequent is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Causation Fallacy", class "Logical Fallacy". Its permanent identifier is HBT-COG-0020 and its evidence grade is B.