1. Economics Department, Birzeit University, PO Box 14, Birzeit, Palestine
2. Master of Development Economics Program, School of Public Administration and Development Economics, Doha Institute for Graduate Studies, PO Box 200592, Al Tarfa Street, Zone 70, Doha, Qatar
3. Université Libre de Bruxelles, 50 avenue F.D. Roosevelt, 1050 Bruxelles, Belgium