Ahmet Koncak Bolu Abant Izzet Baysal University   Faculty of Economics and Administrative Sciences Department of Econometrics Bolu Abant Izzet Baysal University Bolu, 14030 Turkey   akoncak@ibu.edu.tr   sites.google.com/view/akoncak           JEL Areas: I1 : Health: General Q5 : Environmental Economics: General