Synopsis This book is intended for the students preparing for B. Com examination of Delhi University, although this book would also cater to the student of other universities. This book is an endeavour to provide a link between theoretical foundation and practical application. The salient features are: Examination oriented and "teach-your self" approach. Succulent and synthesized expositions without comprising on the under-standability of the concepts. The right size book: Care has been taken so that you are neither lost due to excessive details nor left scurrying for the details elsewhere. Use of tables to comprehend the differences commonly appearing in examinations along with the ‘basis’ for easily remembering them. Suggested reading at the end of each chapter for students with meritorious outlook and urge for detailed expositions of the concepts. Exhaustive and student friendly approach. Numerical examples on monopolistic competition and international trade. Summary at the end of each chapter for quick recapitualation. Model test papers adapted from the recent university examinations. Innovations. Web links to the best sites on the subject to understand the application of concepts in real world.