1. Department of Economics, University of Warwick, Coventry CV4 7AL, UK
2. Department of Econometrics, Monash University, Wellington Road, Clayton, VIC 3800, Australia
3. Department of Finance, The University of Melbourne, 198 Berkeley Street, Carlton, VIC 3010, Australia
4. Econometrics and Finance Group, Netspar, Tilburg University, P.O. Box 90153, 5000 LE, Tilburg, The Netherlands