Emission trading systems have been recently proposed in diffrerent regions to reduce polluting emissions (e.g. in the European Union for carbon dioxide). One of the objectives of these systems is to encourage firms to adopt advanced abatement technologies. However permits create an incentive to...

This paper studies the concept of "mutual aid" developed by Kropotkin, which implies cooperation as a strategic choice. We study this concept in a Sequential Prisoners' Dilemma in a non-cooperative framework and in an indirect evolution framework (with complete and incomplete information). We...