Online Altruism Lab

Simulation with matrix payoff

This multi-agent model investigates the dynamics of interacting defectors and cooperators in a group-structured population. The pairwise interactions are evaluated using a payoff matrix.

The standard setup, as given initially, represents a prisoner's dilemma and nevertheless it generally leads to a stable population of predominantly altruistic agents.

To run the simulation click SETUP and then GO... and observe how the population develops. Click GO again to stop it.

The image shows an example group consisting of eight blue altruists (= cooperators or simply C) and two yellow egoists (= defectors or D). The group boundaries are also marked. Individuals only interact with other group members and receive points according to the specified payoff matrix.

Further information about the model and details about the various parameters can be found further down the page in “Model Info.”

On small devices it may be better to open the model in a separate window.