It is increasingly being recognized that teaching principles of economics helps business administration students better understand the economic forces that helps in taking effective decisions in the real time business practices and also helps in developing and strengthening the overall analytical talent of students to solve present and future business problems.Managerial economics, It is the integration or application of economic principles in business practices or business administration in order to solve the problems of the business. It has been receiving more attention in business as managers become more aware of its potential as an aid to decision-making, and problem solving.This Book on Managerial Economics mainly introduces topics in microeconomics and macroeconomics to students to enable them to apply the same to business decisions. The purpose of this book is to simplify the process of understanding Managerial Economics. The Book covers a narrow range of topics. The readers can make their choice as per the need of study course.The Book is initiated as a reference book for PG and UG students in faculties of Commerce & Management, especially in consideration with MBA students.