Managerial Economics involves an analysis of the allocation of the resources available to a firm, or a unit of management among the activities of that unit. It makes use of concepts and theories of economics and assists managers to make rational decision. The present book emphasizes on conceptual clarity and simplified presentation. The book comprehensively covers all the aspects that impinge upon economic decision making of modern business units. Thus, allowing a great deal of flexibility in the choice of topics that any teacher or student may wish to cover. This text would be helpful for the students of Commerce, Management, Economics, Engineering, Law, and other social sciences disciplines. It is also useful to the practicing managers of various business units within and outside the country. The book integrates various concepts and ideas from the fields of economics and other subjects, which have bearing on managerial decision making and policy formulation within the business unit. It provides a number of suitable examples, including large number of review questions, objective type questions and exercises. The text focuses on the concepts related to macroeconomics and business decision, and modern approaches to managerial economics.