[1] Ondokuz Mayis Univ, Dept Agr Econ, TR-55139 Samsun, Turkey
[2] Univ Educ, Dept Econ, Div Management & Adm Sci, Lahore 54770, Pakistan
[3] Univ Agr Faisalabad, Inst Agr & Resource Econ, Faisalabad 38040, Pakistan
[4] Arab Open Univ, Fac Business Adm, Riyadh 11681, Saudi Arabia
[5] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
[6] Univ Nottingham Ningbo China, Dept Architecture & Built Environm, Ningbo 315100, Peoples R China