Affiliation: | a The T.N. Thiele Centre for Mathematics in Natural Science, Department of Mathematical Sciences, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark;b CREATES, University of Aarhus, Denmark;c Department of Economics, Stanford University, Landau Economics Building, 579 Serra Mall, Stanford, CA 94305-6072, USA;d School of Economics and Management, Aarhus University, Bartholins Allé 10, DK-8000 Aarhus C, Denmark;e Oxford-Man Institute, University of Oxford, Eagle House, Walton Well Road, Oxford OX2 6ED, UK;f Department of Economics, University of Oxford, UK |