Our experimental results suggest that the effectiveness of leading by example decreases with group size. The discrepancy between the leaders' and followers' incentives increases with group size. Thus, as group size increases, followers more often refuse to follow their leaders.

We conduct a field experiment with low-income subjects in Dallas, Texas. We examine voluntary, informal risk sharing using a visual representation of the solidarity game developed for low-literacy populations. We find substantially more ‘fixed gift to loser’ behavior and less...