[1] Univ Nacl Loja, Carrera Econ, Loja 1050, Ecuador
[2] Univ Nacl Loja, Ctr Invest Sociales & Econ, Loja 1050, Ecuador
[3] Univ Vigo, Fac Econ & Business, Campus Univ S-N, Vigo 36310, Spain
[4] Univ Extremadura, Inst Univ Invest Desarrollo Terr Sostenible INTER, Dept Econ Financiera & Contabilidad, Caceres 10071, Spain
[5] Beijing Inst Technol, Sch Management & Econ, Beijing 100081, Peoples R China
[6] Beijing Inst Technol, Ctr Energy & Environm Policy Res, Beijing 100081, Peoples R China
[7] ILMA Univ, Dept Business Adm, Karachi 75190, Pakistan