1. Philipps-University Marburg, School of Business and Economics, Am Plan 2, 35032 Marburg, Germany.
2. University of Innsbruck, Department of Public Finance, Universitätsstrasse 15, Innsbruck 6020, Austria.
3. The Ostrom Workshop, Indiana University, Bloomington, IN 47408, USA.
4. University of Innsbruck, Department of Economic Theory, Economic Policy and Economic History, Universitätsstrasse 15, Innsbruck 6020, Austria.
5. GIGA Institute of African Affairs, Neuer Jungfernstieg 21, 20354 Hamburg, Germany.