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Related Experiment Video

Updated: Jun 6, 2026

A Conflict Model of Reward-seeking Behavior in Male Rats

A Conflict Model of Reward-seeking Behavior in Male Rats

Published on: February 20, 2019

Winners don't punish.

Anna Dreber¹, David G Rand, Drew Fudenberg

¹Program for Evolutionary Dynamics, Harvard University, Cambridge, Massachusetts 02138, USA.

|March 21, 2008

Summary

This summary is machine-generated.

Costly punishment increases cooperation in repeated games but does not improve group payoff. Individuals with the highest total payoffs tend to avoid costly punishment, suggesting it may be maladaptive in cooperation scenarios.

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Area of Science:

Behavioral Economics
Social Psychology
Game Theory

Background:

Cooperation is fundamental to human behavior, involving a trade-off between individual and group interests.
Costly punishment, where individuals incur costs to penalize others, is hypothesized to enhance cooperation.
The role of costly punishment in repeated interactions with reputation effects remains less understood.

Purpose of the Study:

To investigate the impact of costly punishment on cooperation in repeated game settings.
To determine if costly punishment affects group payoff and individual outcomes.
To analyze the relationship between punishment behavior and overall success in cooperation games.

Main Methods:

Experimental economics using repeated game simulations.
Participants chose between cooperation, defection, and costly punishment in each round.
Control groups played without the option of costly punishment.

Main Results:

The availability of costly punishment significantly increased the level of cooperation observed.
Average group payoffs did not improve with the option of costly punishment.
A strong negative correlation was found between total payoff and the use of costly punishment; 'winners' did not punish.

Conclusions:

Costly punishment can promote cooperation in repeated interactions but may not be evolutionarily advantageous for maximizing individual or group gains.
The behavior of 'winners don't punish' suggests that costly punishment might be maladaptive in certain cooperation contexts.
Further research is needed to understand the evolutionary origins and specific functions of costly punishment beyond simple cooperation games.