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Cooperation in Prisoner's Dilemma

A web-based prisoner's dilemma experiment. This uses TurkServer to study how cooperation evolves in a large population over a long period of time.

Before diving into the code, you may want to check out Meteor, on which this app is built, or the tutorial for TurkServer.

Experiment Demo:

You and a group of friends can play with this experiment as we ran it by following these instructions:

  1. git clone --recursive https://github.com/TurkServer/long-run-cooperation.git
  2. Go into the folder and run meteor --settings settings-template.json
  3. Go to http://localhost:3000/ (or whatever port you are running Meteor on) to log in as a user.

Every user has to log in from a different browser session. The admin ("experimenter") must advance each round of the game manually. The default password for logging into the admin console is something.

If you don't have 50 friends to play with you, check out https://github.com/TurkServer/cooperation-loadtest, which can connect an arbitrary number bots to this app (making random cooperate/defect decisions). We used this to test server load limits before deploying the experiment.

Once you're done the games, you can go to http://localhost:3000/viz/pilot to see a visualization of the data collected in the game. It will look something like the following image, which we collected 20 times during our experiment. We've found these demo games to be a useful pedagogical tool for teaching behavioral game theory and learning effects.

Day Example

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Virtual lab study of long-run cooperation in prisoner's dilemma

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