Evolution of Reciprocity in Asymmetric International Environmental Negotiations

We study the evolutionary success of a generalised trigger strategy within an asymmetric, n-player Prisoner's Dilemma environment, with application to the evolution of cooperation in international environmental negotiations. Our results suggest that there exist regions in the relevant parameter space - i.e. costs and benefits, low and high tit-for-tat thresholds, probability of continued interaction - such that (partial) cooperation may emerge as long-run attractor of the evolutionary dynamics in these asymmetric social dilemmas.