1. Centre for Systems, Dynamics and Control, Department of Mathematics, University of Exeter, Harrison Building, Exeter EX4 4QF, UK
2. Department of Economics, University of Oxford, Oxford, UK
3. Department of Management, Technology and Economics, ETH Zurich, Scheuchzerstrasse, 7, Zurich CH-8092, Switzerland
4. Swiss Finance Institute, c/o University of Geneva, 40 blvd. Du Pont d'Arve, Geneva 4 CH 1211, Switzerland
5. Institute of Risk Analysis, Prediction and Management (Risks-X), Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen 518055, People's Republic of China