[1] Nanjing Normal Univ, Sch Business, Nanjing, Peoples R China
[2] Inst Forecasting & Macroecon Res, Tashkent, Uzbekistan
[3] Tashkent State Univ Econom, Math Methods Econ, Tashkent, Uzbekistan
[4] Swedish Univ Agr Sci SLU, Dept Econ, Uppsala, Sweden
[5] Arish Univ, Dept Econ & Rural Dev, Al Arish, Egypt
[6] Guangdong Acad Agr Sci, Inst Agr Econ & Informat, Guangzhou, Peoples R China