This collection of essays on Verdoorn's Law - the relationship between the growth of industrial productivity and output - presents a number of comprehensive surveys and assessments of the vast literature available. The collection not only includes an English translation of Verdoorn's seminal article originally published in Italian, but also new empirical evidence for the Verdoorn Law and new developments in the theoretical modelling of cumulative causation.Introduction; J.McCombie, M.Pugno & B.Soro Factors that Determine the Growth of Labour Productivity: P.J.Verdoorn (Translation by A.P. Thirlwall ) 'Fattori che Regolano lo Sviluppo della Produttivita del Lavoro': Fifty Years On; B.Soro Increasing Returns and Economic Growth from a Kaldorian Perspective; J.McCombie A Reappraisal of Verdoorn's Law for the Italian Economy 1957-1997; C.Bianchi The Verdoorn Law: Some Evidence from Non-Parametric Frontier Analysis; S.Destefanis Productivity Growth and Unemployment: Does a Trade-off Exist?; M.Roberts Cumulative Causation and the Catching-up Debate from a Disequilibrium Standpoint; M.A.Leon-Ledesma Verdoorn's Law: Some Notes on Output Measurement and the Role of Demand; G.Rampa Verdoorn's Law and the Analysis of Steady State Growth: From an Unsatisfactory Marriage to a New Perspective; M.Pugno References IndexCARLUCCIO BIANCHI Professor of Economic Policy, University of Pavia, ItalySERGIO DESTEFANIS Associate Professor of Economics, University of Salerno, ItalyMIGUEL A. LE?N-LEDESMA Lecturer in Economics, University of KentGIORGIO RAMPA Professor of Economics, University of Genoa, ItalyMARK ROBERTS Fellow in Economics, Cambridge University, UK