Overcoming moral hazard with social networks in the workplace: An experimental approach∗

The use of social networks in the workplace has been documented by many authors, although the reasons for their widespread prevalence are less well known. In this paper we present evidence based on a combined field-laboratory experiment that social networks are used by employers to reduce worker moral hazard. The worker chooses an effort level given a fixed wage under different settings of social proximity. Social proximity is captured using actual Facebook friendship information revealed anonymously to subjects once they have been recruited. Since employers themselves do not have access to social connections, they delegate the decision to referrers who can select among workers with different degrees of social proximity to themselves. We show that employers choose referrals over anonymous hiring about 80% of the time. In keeping with our predictions, referrers also choose workers with a greater social proximity to themselves and workers who are closer to referrers indeed pay back more to the referrer. The advantage of the lab setting is that we can isolate moral hazard and directed altruism as the main driving forces for these results.