Bertrand, Marianne , Simeon Djankov, Rema Hanna, and Sendhil Mullainathan. 2006. "Does Corruption Produce Unsafe Drivers?" Quarterly Journal of Economics, 122(4), 1639-1676.
Olken, Benjamin. 2007. "Monitoring Corruption: Evidence from a Field Experiment in Indonesia." Journal of Political Economy, 15(2), 200-249.