Preface.- Chapter 1: Executive Summary.- Part I. Regional Economic Structure and Productivity.- Chapter 2: Regional Economic Structure in Japan.- Chapter 3: Regional Productivity and Convergence.- Chapter 4: Regional Productivity and Determinants.- Part II. Inter-Regional Network Economies.- Chapter 5: Inter-Regional Networks and Productivity Dynamics.- Chapter 6: Inter-Regional Networks and Regional Disparities.- Chapter 7: Solow Residual Approach to Inter-Regional Network Economies.- Part III. Regional Sustainability and Energy Conservation.- Chapter 8: Regional Sustainability and Energy Intensity.- Chapter 9: Regional Sustainability and Energy Efficiency.- Chapter 10: Inter-Regional Network Formation and Modal Shift Potential.