Reciprocal Altruism is cooperation between unrelated agents when future reciprocity is likely. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0565, within the Social family. The core principle: cooperation between unrelated agents when future reciprocity is likely. 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
Cooperation between unrelated agents when future reciprocity is likely.
Plain-English Definition
Cooperation between unrelated agents when future reciprocity is likely.
Feynman Explanation
Today's favor is tomorrow's invoice.
Core Principle
Cooperation between unrelated agents when future reciprocity is likely.
Mechanisms
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Inputs (Triggers)
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Outputs (Behaviors)
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Behavioral Signature
Today's favor is tomorrow's invoice.
Examples
- Open-source contributions flow where reputation tracks the gift.
- B2B relationships run on long-arc reciprocity, not contracts.
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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 operates in the Cognition dimension — how do we think?. You can recognize it in the field by its signature: today's favor is tomorrow's invoice. 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, models that 'remember' favors create stickier relationships than smarter ones. It is amplified whenever b2B relationships run on long-arc reciprocity, not contracts. Inside organizations that shows up as b2B relationships run on long-arc reciprocity, not contracts. 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 design for repeat interaction; reciprocity collapses in one-shot games. Design against it the way you would design against a known failure mode — assume it will appear, and price the exploit before someone finds it.
Famous Experiments
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Design Principles
- Design for repeat interaction; reciprocity collapses in one-shot games.
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.
- Design for repeat interaction; reciprocity collapses in one-shot games.
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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.
We defer to perceived expertise, rank, or uniform.
Membership in a group is a baseline human need.
We say yes more often to people we like.
Stored social capital from prior behavior.
Things feel more valuable when supply or time is limited.
Unwritten rules that govern behavior in a group.
Position in a hierarchy is a primary driver of behavior.
Strong in-group loyalty paired with out-group skepticism.
Shared identity ('we') drives compliance harder than shared interest.
Clear ownership of outcomes, not just tasks.
Asymmetric information attracts the worst counterparties.
Vastness that exceeds existing schemas dissolves the self briefly.
Where Reciprocal Altruism 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 Reciprocal Altruism
- What is Reciprocal Altruism?
- Reciprocal Altruism is cooperation between unrelated agents when future reciprocity is likely. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0565, within the Social family. The core principle: cooperation between unrelated agents when future reciprocity is likely. 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 Reciprocal Altruism?
- B2B relationships run on long-arc reciprocity, not contracts. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0565).
- How is Reciprocal Altruism exploited?
- Models that 'remember' favors create stickier relationships than smarter ones.
- How do you design around Reciprocal Altruism?
- Design for repeat interaction; reciprocity collapses in one-shot games.
- Which behavioral dimension does Reciprocal Altruism belong to?
- Reciprocal Altruism is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Social", class "Concept". Its permanent identifier is HBT-COG-0565 and its evidence grade is C.