Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
That individuals contribute in social dilemma interactions even when contributing is costly is a well-established observation in the experimental literature. Since a contributor is always strictly worse off than a non-contributor the question is raised if an intrinsic motivation to contribute can survive in an evolutionary setting. Applying stochastic evolutionary dynamics we give conditions for equilibria with a positive number of contributors to be selected in the long run.