Ping-lung Hsin Graduate Institute of National Development, National Taiwan University   #407, Grad. Inst. of National Development, NTU No.1, Sec. 4, Roosevelt Road Taipei, Taiwan 106 Rep. of China (R.O.C.)   plh@ntu.edu.tw   http://www.nd.ntu.edu.tw/people/bio.php?PID=25           JEL Areas: J0 : Labor and Demographic Economics: General J3 : Wages, Compensation, and Labor Costs: General