[1] Univ Malaya, Fac Econ & Adm, Dept Dev Studies, Kuala Lumpur 50603, Malaysia
[2] Univ Malaya, Fac Econ & Adm, CPDS, Kuala Lumpur, Malaysia
[3] UUM, Sch Int Studies, Sintok 06010, Kedah, Malaysia
[4] UTM, IBS, Jalan Semarak, Kuala Lumpur 54100, Malaysia
[5] Univ Tenaga Nas, Inst Energy Policy & Res IEPRe, Jalan Ikram Uniten, Kajang, Selangor, Malaysia