This book is designed as the updated syllabus of B.A.(Hons.) Economics and B.Com. (Hons.) of the universities. Also added various topics of UGC new syllabi of B.A. (Hons.) Economics, B.Com. (Hons.) and B.A. (Hons.) Business Economics under the ';Choice Based Credit System' (CBCS) which is to be adopted by all India Universities. It explains the use of graphs in economics, various types of curves and measurement of their slopes, the concept of function, both linear and power functions, the concept of derivatives and the use of differential calculus as optimising technique for solving the problems of maximisation and minimisation in economics. This book will help the students to understand various economic theories better as economics in recent years has become increasingly mathematical. This book will also be of immense use for professional courses such as Business Economics, BBA, CA, ICWA and for the candidates preparing for all India and State level competitive examinations such as IAS, IES and allied services.