Daniel Chudnovsky held a D. Phil. in Economics from Oxford University. He taught Development Economics at the University of San André s and was Director of the Centro de Investigaciones para la Transformació n (CENIT) in Argentina. André s Ló pez is Doctor in Economic Sciences at the University of Buenos Aires. He is Principal Researcher at the Centro de Investigaciones para la Transformació n (CENIT), Buenos Aires, Argentina and teaches Development Economics at the University of Buenos Aires. Both Chudnovsky and Ló pez have written extensively