Social comparison has potentially far reaching consequences in many economic domains. We conducted a field experiment to examine how social comparison affects workers' effort provision if their own wage or that of a co-worker is cut. Workers were assigned to groups of two, performed identical...

Many people contribute to public goods but stop doing so once they experience free riding. We test the hypothesis that groups whose members know that they are composed only of "like minded" cooperators are able to maintain a higher cooperation level than the most cooperative, randomly composed...