This book analyses how closer regional connectivity and economic integration between South Asia and Southeast Asia can benefit both regions, with a focus on the role played by infrastructure and public policies in facilitating this process. Country studies of national connectivity issues and policies cover Bangladesh, India, Myanmar, Nepal, Sri Lanka and Thailand, examining major developments in South Asia-Southeast Asia trade and investment, economic cooperation, the role of economic corridors, and regional cooperation initiatives. Thematic chapters explore investment in land and sea transport infrastructure, trade facilitation, infrastructure investment financing, supporting national and regional policies, and model-based estimates of the benefits of integration. Employing a state-of-the-art computable general equilibrium (CGE) model, the book provides a detailed an up-to-date discussion of issues, innovations and progress.