Tit for Tat is start cooperative; copy your counterpart's last move thereafter. It sits in the Social dimension (SOC) of the Human Behavior Taxonomy™ as element HBT-SOC-0035, within the Strategy family. The core principle: start cooperative; copy your counterpart's last move thereafter. 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
Start cooperative; copy your counterpart's last move thereafter.
Plain-English Definition
Start cooperative; copy your counterpart's last move thereafter.
Feynman Explanation
The winningest strategy in repeated games. Also good parenting.
Core Principle
Start cooperative; copy your counterpart's last move thereafter.
Mechanisms
Pending editorial review.
Start cooperative; copy your counterpart's last move thereafter.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Strategy for repeated negotiation.
Inputs (Triggers)
Pending editorial review.
Outputs (Behaviors)
Pending editorial review.
Behavioral Signature
The winningest strategy in repeated games. Also good parenting.
Examples
- Reciprocal partnership norms.
- Strategy for repeated negotiation.
Pending editorial review.
Original analysis from The Incentives Lab — how this element behaves inside real payoff structures.
Why this element matters to incentive design
Most organizations meet this element as a personnel problem. It is not one. The mechanism underneath it is straightforward: start cooperative; copy your counterpart's last move thereafter. You can recognize it in the field by its signature: the winningest strategy in repeated games. Also good parenting. Every element in the Social 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, strategy for repeated negotiation. It is amplified whenever strategy for repeated negotiation. Inside organizations that shows up as strategy for repeated negotiation. 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 use forgiving variants; small punishments, fast resets. The test of any redesign here is simple: after the change, can you name what the organization is now doing less of? If not, the payoff structure did not actually move.
Famous Experiments
Pending editorial review.
Design Principles
- Use forgiving variants; small punishments, fast resets.
Measurement Approaches
Pending editorial review.
Evidence
Pending editorial review.
Pending editorial review.
The Perverse Incentive Lens™
How this behavior is exploited — and how to redesign around it.
- Use forgiving variants; small punishments, fast resets.
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.
Combine extreme safety with extreme risk; avoid the middle.
Game theory adjusted for how humans actually play — including fairness, reciprocity, and limited reasoning.
Allocating finite resources across many fronts when the opponent does the same — no dominant strategy exists.
Coordinated action that produces outcomes unavailable to individual actors.
Designing organizations to ride doubling curves — AI, data, compute, biotech — rather than linear improvement.
Decisions depend on what other strategic actors will do.
Individual rationality produces collective irrationality.
Causal chain from inputs to outputs to outcomes to impact.
Where, how, what — in that order.
One party's gain is exactly another party's loss.
Reverse-engineering the internal sequence — visual, auditory, kinesthetic — an expert uses to produce a result.
Unconscious psychological strategies that protect self-image.
Where Tit for Tat is cited in the corpus
Essays, field guides, and diagnostics from The Incentives Lab that apply this element.
- EssayYour Best People Are Optimizing Against You
Social proof and internal competition.
- DiagnosticCultural Performance Audit™
How revealed group behavior is measured.
- EssayAI Agents Inherit Your Incentives
How this element propagates into automated systems.
- 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 Tit for Tat
- What is Tit for Tat?
- Tit for Tat is start cooperative; copy your counterpart's last move thereafter. It sits in the Social dimension (SOC) of the Human Behavior Taxonomy™ as element HBT-SOC-0035, within the Strategy family. The core principle: start cooperative; copy your counterpart's last move thereafter. 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 Tit for Tat?
- Strategy for repeated negotiation. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-SOC-0035).
- How is Tit for Tat exploited?
- Strategy for repeated negotiation.
- How do you design around Tit for Tat?
- Use forgiving variants; small punishments, fast resets.
- Which behavioral dimension does Tit for Tat belong to?
- Tit for Tat is classified in the Social dimension (SOC) of the Human Behavior Taxonomy™, family "Strategy", class "Mental Model". Its permanent identifier is HBT-SOC-0035 and its evidence grade is B.