[1] Univ Ibadan, Ctr Econometr & Allied Res, Ibadan, Nigeria
[2] Univ Econ Ho Chi Minh City, Inst Business Res, Ho Chi Minh City, Vietnam
[3] West African Monetary Agcy, Res & Stat Dept, Freetown, Sierra Leone
[4] Cent Bank Nigeria, Monetary Policy Dept, Abuja, Nigeria
[5] Univ Econ Ho Chi Minh City, Inst Business Res & CFVG Ho Chi Minh City, Ho Chi Minh City, Vietnam