1. College of Economics and Management, Shanghai Maritime University, Pudong District, Shanghai 201306, China
2. Institute of Finance and Economics, Shanghai University of Finance and Economics, Yangpu District, Shanghai 200433, China
3. Antai College of Economics and Management, Shanghai Jiao Tong University, Xuhui District, Shanghai 200030, China
4. Department of Applied Economics, University of Minnesota-Twin Cities, St. Paul, MN 55108, USA
5. Department of Horticultural Science, University of Minnesota-Twin Cities, St. Paul, MN 55108, USA