Some aspects of optimal investment policy in an underdeveloped economy / by S. Chakravarty -- Optimum savings program / a note by J. C. Sagal -- Efficient, inefficient and critical growth / by M. inagaki -- Models of balanced and maximum growth in dualistic economies / by A. Qayum -- Some exercises with a simple model for world development planning / by B. Herman, L. B. M. Mennes and J. G. Waardenburg -- Economic integration and the optimum international distribution of production / by H. C. Bos and A. Kuyvenhoven -- Trade flows and geographical distance, or the importance of being neighbors / by H. Linnemann -- Imports from developing countries / by F. P. Jansen and L. H. Jansen -- Stages in planning / by Y. B. De Wit -- The semi-input-output method under upper bounds / by P. A. Cornelisse and J. Versluis -- Factor intensities in Mexico with special reference to manufacturing / by G. K. Boon -- Export policy in Pakistan / by N. Islam -- Interindustry relations / L. H. Klaassen and A. C. Van Wickeren -- The optimal number of factories in a spatial market by / J. Serck-Hanssen -- Some reflections on the effecto micro and back / by J. C. Ramaer.