Dongpeng Liu University of California, Riverside   3122 Sproul Hall 900 University Ave UC, Riverside Riverside, California 92521 USA   dliu011@ucr.edu             JEL Areas: E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data) J6 : Mobility, Unemployment, and Vacancies: General