Preface -- Services and the Changing Economic Structure -- Modern Service Sector Growth: Causes and Effects -- Comment on Herbert G. Grubel and Michael A. Walker, Modern Service Sector Growth: Causes and Effects -- Defining and Measuring Output and Productivity in the Service Sector -- Comment on Domenico Siniscalco, Defining and Measuring Output and Productivity in the Service Sector -- International Aspects -- International Transactions Involving Interactions: A Conceptual Framework Combining Goods and Services -- Services and Comparative Advantage Theory -- Comment on H. Peter Gray, Services and Comparative Advantage Theory -- Trade and Foreign-Owned Production in Services: Some Conceptual and Theoretical Issues -- Comment on John H. Dunning, Trade and Foreign-Owned Production in Services: Some Conceptual and Theoretical Issues -- Sectoral Analysis -- Telecommunications and the Scope of the Market in Services -- Comment on Gerald R. Faulhaber, Telecommunications and the Scope of the Market in Services -- Telecommunications Policy - Assessing Recent Experience in the US, Japan and Europe and Its Implications for the Completion of the Internal Common Market -- Comments on Gunter Knieps, Telecommunications Policy - Assessing Recent Experience in the US, Japan and Europe and Its Implications for the Completion of the Internal Common Market -- Protection and the Structure of the Banking Industry in an International Context -- Comment on Robert Z. Aliber, Protection and the Structure of the Banking Industry in an International Context -- Integrated World Markets in Services: Problems and Prospects -- Comment on Brian Hindley, Integrated World Markets in Services: Problems and Prospects -- Services and International Division of Labour -- North-South Trade in Services: Some Empirical Evidence -- Comment on Rolf J. Langhammer, North-South Trade in Services: Some Empirical Evidence