Lie aversion and self-reporting in optimal law enforcement

Requirements that individuals or companies self-report violations are common in regulation and law enforcement. This paper studies how violators’ aversion to lying affects the design and merit of enforcement regimes that require self-reporting. Even when a self-reporting requirement produces costs of lies and enjoys no economic advantage in the absence of lie aversion, I find that self-reporting improves enforcement efficiency. With lie aversion, self-reporting enables greater deterrence of violations at a lower cost of monitoring. Corollaries to this result are that (1) the presence of lie aversion enhances social welfare; (2) enforcement regimes that elicit more noxious lies when false reports are made—for example, a compulsory versus voluntary self-reporting feature—are advantageous; and (3) under an optimal enforcement regime, lying generally occurs and the self-reporting sanction is higher than the average sanction for a false report.