This article reports results from an experiment studying how fines, leniency and rewards for whistleblowers affect cartel formation and prices. Antitrust without leniency reduces cartel formation but increases cartel prices: subjects use costly fines as punishments. Leniency improves antitrust by strengthening deterrence but stabilizes surviving cartels: subjects appear to anticipate the lower post-conviction prices after reports/leniency. With rewards, prices fall at the competitive level. Overall our results suggest a strong cartel deterrence potential for well-run leniency and reward schemes. These findings may also be relevant for similar white-collar organized crimes, like corruption and fraud.
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