1. Department of Economics and Social Sciences, Helmut Schmidt University Hamburg, Hamburg, Germany
2. Ifo Institute for Economic Research, CESifo, Munich, Germany
3. EcoAustria - Institute for Economic Research, Vienna, Austria
4. Center for Media, Data and Society (CMDS), Central European University, Budapest, Hungary
5. Düsseldorf Institute for Competition Economics (DICE), Düsseldorf, Germany