1. W.E. Nelson Professor of Financial Economics, University of Portland, 5000 N. Willamette Blvd., Portland 97203, Oregon
2. Schulte Professor of Finance, University of Portland, 5000 N. Willamette Blvd., Portland 97203, Oregon
3. Department of Economics, Macquarie University, Sydney 2109, Australia
4. Foundation Professor of Economics, College of Business University of Nevada, Reno 89557, Nevada