The Hired Gun Mechanism
---- Acknowledgements -----
We would like to thank our colleagues at UCSD, participants in the Social Dilemmas Conference, participants at the ESA 2010 Conference, participants at the SWET 2011, Kristy Buzzard, Simon Gachter, Nikos Nikiforakis and Anya Savikhina for helpful comments during the writing of this paper. Andreoni also gratefully acknowledges the National Science Foundation, grant 1024683, for financial support. The views expressed herein are those of the author and do not necessarily reflect the views of the National Bureau of Economic Research.