Sooriyakumar Krishnapillai University of Jaffna   Department of Agricultural Economics Faculty of Agriculture University of Jaffna Kilinochchi, Northen 44000 Sri Lanka   ksoori@univ.jfn.ac.lk   https://sites.google.com/univ.jfn.ac.lk/sooriyakumar/home           JEL Areas: D0 : Microeconomics: General C1 : Econometric and Statistical Methods: General