First Author:   Mazbahul Golam Ahamad Shahjalal University of Science and Technology mg.ahamad@gmail.com   House: 40/C, Road: 11, Dhanmondi Dhaka, 1209, Bangladesh   +8801717258612(Phone) +8801717258612(Fax) Second Author: Rezai Karim Khondker Shahjalal University of Science and Technology rkhondker50@gmail.com   Shahjalal University of Science and Technology, Department of Economics Sylhet, 3114, Bangladesh   +8801715049888(Phone)