Hsihchia Hsieh providence univ   9,alley 24,lane 52,shih-wey road,taipei,taiwan 9,alley 24,lane 52,shih-wey road,taipei,taiwan taipei, taiwan 106 台灣   hsihchia.hsieh@gmail.com             JEL Areas: A : General Economics and Teaching E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data)