: that altruistic punishment can sustain cooperation. This paper extends their model in order to explain such recent findings …. It focuses on fear of punishment, not punishment itself, as the key mechanism to sustain contributions to the public good … differs, on average, in less than 5% compared to relevant experiments with punishment in the lab. …

via social learning. Using an online social dilemma experiment, we find evidence that participants' contributions were … learning strategies employed within the experiment, but that this cooperative propensity could be reduced through selection …