The Interaction of Public and Private Cartel Enforcement

The prohibition of cartels is enforced by both public and private legislation, which may interact in a way that reduces their effectiveness. This article investigates these interaction effects specifically for the leniency programme and civil damages claims, by means of a conjoint analysis. Dutch companies and competition lawyers were faced with different enforcement situations containing a mix of public and private enforcement elements and were asked in which case they were most likely to apply for leniency. Their answers are analysed with a nested logit model, allowing for the possibility that respondents would continue the cartel in either of the presented enforcement situation. For firms, the corporate and personal fine and the fine reduction mattered in deciding to apply for leniency. Competition lawyers took the fine reduction, disclosure of leniency and burden of proof into account when advising on self-reporting the agreement. Both groups of respondents answered that in 16–19% of the situations they would continue the agreement and not apply for leniency/advice to so do (The authors thank the participating economists of the Dutch Competition Authority for their input and suggestions. Special thanks to Dr Ron Kemp, the competition lawyers who were willing to discuss the research results with the authors, prof. Dr Barbara Baarsma and prof. Dr Bas ter Weel.).