1. World Trade Organization , Geneva, Switzerland
2. Robert Schuman Centre for Advanced Studies, European University Institute, Florence, Italy
3. Department of Law and Economics, University of Bayreuth , Bayreuth, Germany
4. CEPII, Paris, France; ifo Institute, CESifo, Munich, Germany; GEP, University of Nottingham, United Kingdom
5. School of Economics, Drexel University , Philadelphia, PA, USA
6. ifo Institute, CESifo, Munich, Germany