1. Department of Economics and Finance City University of Hong Kong 83 Tat Chee Avenue HKSAR China
2. Department of Management Sciences City University of Hong Kong 83 Tat Chee Avenue HKSAR China
3. Center for Forecasting Science Chinese Academy of Sciences Beijing 100190 China
4. School of Economics and Management, and MOE Social Science Laboratory of Digital Economic Forecasts and Policy Simulation, University of Chinese Academy of Sciences Beijing 100190 China