JOHN MCCOMBIE is Director of the Centre for Economic and Public Policy, University of Cambridge, UK, and Fellow in Economics, Downing College, University of Cambridge, UK. He has previously held positions at the University of Hull and the University of Melbourne. His research interests include the study of national and regional growth disparities, economic growth and balance-of-payments constraint, and criticisms of the aggregate production function and conventional measures of the rate of technical progress. CARLOS RODR GUEZ GONZ LEZ teaches at the Department of Applied Economics V, Un