Ya-Ming Liu National Check Kung University   No. 1 University Road Department of Economics National Cheng Kung University Tainan, 70101 Taiwan   ymliu@mail.ncku.edu.tw   http://economics.ncku.edu.tw/en/faculty.asp           JEL Areas: J : Labor and Demographic Economics E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data)