Rui Wang Faculty of Economics, Rissho University   4-2-16 Osaki Shinagawa-ku, Tokyo 141-8602 Japan   wangrui@ris.ac.jp             JEL Areas: E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data) F4 : Macroeconomic Aspects of International Trade and Finance: General