First Author:   Nathapornpan Uttama Economics Program, School of Management, Mae Fah Luang University nathapornpan@mfu.ac.th   333 Moo 1, Tasud Muang, 57100, Thailand   +6653916680(Phone) +6653916680(Fax) mfu.ac.th Second Author: Popkarn Arwatchanakarn Mae Fah Luang University popkarn.arw@mfu.ac.th         http://