1. School of Economics, Fujian Normal University, Fuzhou, Fujian 350007, P.R. China
2. Department of Economics, Soochow University, 56, Kueiyang St., Sec. 1, Taipei 100, Taiwan, R.O.C.
3. Department of Business Administration, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan, R.O.C.