Andrew Phiri Department of Economics, Faculty of Business and Economic Studies, Nelson Mandela University   Embizweni building South Campus, University way, Summerstrand, Port Elizabeth, South Africa 6031 South Africa   phiricandrew@gmail.com             JEL Areas: C2 : Single Equation Models; Single Variables: General N1 : Economic History: Macroeconomics and Monetary Economics; Growth and Fluctuations: General, International, or Comparative