1. KOF, ETH Zurich, CEPR, WIFO, CESifo; Center for Taxation Said Business School; University of Oxford; Oxford UK
2. Centre for Globalisation and Economic Policy; University of Nottingham; Nottingham UK
3. Bauhaus Luftfahrt e.V.; Munich Germany
4. Ifo Institute for Economic Research; CESifo; University of Bayreuth; Bayreuth Germany