Ordered Leniency: An Experimental Study of Law Enforcement with Self-Reporting

This paper reports the results of an experiment designed to assess the ability of an enforcement agency to detect and deter harmful short-term activities committed by groups of injurers. With ordered-leniency policies, early cooperators receive reduced sanctions. We replicate the strategic environment described by Landeo and Spier (2018). In theory, the optimal ordered leniency policy depends on the refinement criterion applied in case of multiplicity of equilibria. Our findings are as follows. First, we provide empirical evidence of a "race-to-the-courthouse" effect of ordered leniency: Mild and Strong Leniency induce the injurers to self-report promptly. These findings suggest that the injurers' behaviors are aligned with the risk-dominance refinement. Second, Mild and Strong Leniency significantly increase the likelihood of detection of harmful activities. This fundamental finding is explained by the high self-reporting rates under ordered-leniency policies. Third, as a result of the increase in the detection rates, the averages fines are significantly higher under Mild and Strong Leniency. As expected when the risk-dominance refinement is applied, Mild Leniency exhibits the highest average fine.