1. a Faculty of Business Administration , University of Macau, Avenida Padre Tomas Pereira , Taipa, Macau 999087, China
2. b College of Business and Economics, California State University , PO Box 6848, Fullerton, CA 92834-6848, USA
3. c Department of Economics , Hong Kong Baptist University , WLB, Shaw Campus, Kowloon Tong, Hong Kong