1. School of Economics and Management, Yantai University, Yantai, P.R. China
2. School of Economics and Business Administration, Central China Normal University, Wuhan, P.R. China
3. College of Economics and Management, Huazhong Agricultural University, Wuhan, P.R. China
4. College of Economics and Management, Digital Countryside Research Institute, South China Agricultural University, Guangzhou, P.R. China