1. a Faculty of Administrative Studies, York University , 4700 Keele Street, North York , Ontario , Canada M3J 1P3
2. b Department 6H33 , Stop 250, Bell Northern Research Ltd., PO Box 3511, Station C, Ottawa , Ontario , Canada, KlY 4H7
3. c Walter A. Haas School of Business, University of California , Berkeley , California , 94720 , USA