We are grateful to Johannes H\H orner for a very helpful discussion. We are indebted to Nageeb Ali, Abhijit Banerjee, Michael Callen, Yeon Koo Che, Hans Christensen, Ray Fisman, Matt Gentzkow, Bob Gibbons, Navin Kartik, David Martimort, Andrea Prat, Jesse Shapiro, as well as seminar audiences at Berkeley, Columbia, Essex, Hebrew University, the Institute for Advanced Study, the 2013 Winter Meeting of the Econometric Society, MIT, MIT Sloan, the Nemmers Prize Conference, NYU, NYU IO day, Paris School of Economics, Pompeu Fabra, ThReD, and the UCSD workshop on Cellular Technology, Security and Governance for helpful conversations. NBER working papers are circulated for discussion and comment purposes. They have not been peerreviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications.© 2014 by Sylvain Chassang and Gerard Padró i Miquel. All rights reserved. Short sections of text, not to exceed two paragraphs, may be quoted without explicit permission provided that full credit, including © notice, is given to the source.
ABSTRACTWe consider a game between a principal, an agent, and a monitor in which the principal would like to rely on messages by the monitor to target intervention against a misbehaving agent. The difficulty is that the agent can credibly threaten to retaliate against likely whistleblowers in the event of an intervention. In this setting intervention policies that are very responsive to the monitor's message provide very informative signals to the agent, allowing him to shut down communication channels. Successful intervention policies must garble the information provided by monitors and cannot be fully responsive. We show that even if hard evidence is unavailable and monitors have heterogeneous incentives to (mis)report, it is possible to establish robust bounds on equilibrium corruption using only non-verifiable reports. Our analysis suggests a simple heuristic to calibrate intervention policies: first get monitors to complain, then scale up enforcement while keeping the information content of intervention constant.