This book introduces several new-fangled and forward-thinking econometric models of international economics. These ground-breaking models introduced in this book are the Hecksher-Ohlin-Tesfay effect, Tesfay generalized extensive margin effect, Tesfay Eigenvalue Technique of detecting structural changes in the country¿s participation in the international trade, Tesfay-Estimator of Trade pattern configuration, Tesfay-Solibakke Estimator of intra-trade industry, Hyper hybrid coordination, and Kraljic-Tesfay Portfolio Matrix. The innovations and the introduction of these models help to optimize the efficiency of estimators over the existing gravity model of international trade. The book has six chapters that contain extensive econometric analysis. The book is designed to assist international economists and policymakers.