1. LMU Munich, ifo Institute, CESifo, and CEPR Munich Germany
2. Department of Economics NTNU Trondheim, CEPR, and CESifo Norway
3. Department of Law and Economics University of Bayreuth, CEPII, CESifo, and GEP Germany
4. Google Munich Germany
5. LMU Munich, ifo Institute, and CESifo Munich Germany