Abstract:Relying on a small natural field experiment with random assignment of treatments, I estimate effects of three core elements of most monitoring and enforcement practices: self-reporting, audit frequency and specific deterrence. I find evidence of evasive reporting of violations in self-audits, as more violations are detected in on-site audits than in self-audits. Announcing the increased audit frequency has no effect on compliance, but an audit raises the firm's subsequent compliance substantially.Keywords: environmental regulation, enforcement, EPA, natural field experiment, random assignment JEL classification: K42, C93, Q58, D21, H41 Acknowledgements: I would like to thank Karine Nyborg, Sandra Rousseau and Jay Shimshack, as well as participants at several seminars, for encouraging and helpful comments. I am grateful to the Norwegian Environmental Protection Agency (Klima-og forurensningsdirektoratet) for outstanding cooperation on this project, and I would particularly like to thank Inger Marie Haaland, Line Telje Høydal, Gro Hagen, Einar Knutsen, Cecilie Kristiansen, Ragnhild Orvik and Anne Marie Mo Ravik. The usual disclaimer applies.
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