1 Introduction.- Part I: Theory of Economic Growth.- 2 Neoclassical Growth Theory and Standard Models.- 3 Growth Models with Spatial Externalities.- 4 Convergence: Theory and Evidence.- Part II: A Model of Regional Growth.- 5 Remarks on Regional Growth.- 6 Structure of the Model.- 7 Evolution of Factors and Output.- 8 Implications for Output Growth.- Part IV: Empirics.- 9 Regions, Variables and Data.- 10 Spatial Econometric Specification and Estimation.-...