1. School of Management, University of Science and Technology of China, Hefei, Anhui Province, P.R. China
2. Institute of Urban and Rural Economics, Anhui Academy of Social Sciences, Hefei, Anhui Province, P.R. China
3. Center for Crisis Management Research (Sponsored by Beijing Planning Office of Philosophy and Social Science), School of Public Policy and Management, Tsinghua University, Beijing, P.R. China
4. Department of Economics, Tippie College of Business, University of Iowa, Iowa City, USA