First Author:   Md Abdul Wadud Department of Economics, Rajshahi University wadud68@yahoo.com   Professor, Department of Economics, Rajshahi University Rajshahi, 6205, Bangladesh   00880 721 810972(Phone) 00880 721 810972(Fax) Second Author: Qamarullah Bin Tariq Islam Department of Economics, Rajshahi University qbtislam@yahoo.com   Lecturer, Department of Economics, Rajshahi University Rajshahi, 6205, Bangladesh   00880 721 750409(Phone) 00880 721 750064(Fax) Third Author: Tariq Saiful Islam Department of Economics, Rajshahi University tariqsaiful@yahoo,com   Professor, Department of Economics, Rajshahi University Rajshahi, 6205, Bangladesh   00880 721 750409(Phone) 00880 721 750064(Fax)