1. Oxford Centre for the Analysis of Resource Rich Economies (OxCarre), Department of Economics, University of Oxford, Oxford OX1 3UQ, United Kingdom;
2. Natural Resource Governance Institute, New York, NY 10004
3. Faculty of Economics and Business Administration and Tinbergen Institute, VU University Amsterdam, 1081 HV Amsterdam, The Netherlands;
4. De Nederlandsche Bank, 1017 ZN Amsterdam, The Netherlands