In this short comment, we report our observation of an anomaly in the raw data of Duffy and Ochs (2009) and describe a possible method for examining experimental data consistency in Prisoner Dilemma experiments, and possibly other experiments

Efficient coordination in large groups is a fundamental issue in economic organizations. We consider the weak-link game with the feature of economies of scale that is necessary for voluntary group growth, in a minimal setup with exit and merger options that allows for bi-directional changes in...