This book has been primarily designed to equip readers with important concepts and theories of Micro Economics. It is extremely useful for the students of B Com (P), B Com (H), BBA, CA CPT, CS FOUNDATION, MBA, and BBE of various universities of India and abroad. It is also useful for students preparing for different competitive examinations in which Economics is included in curriculum. It provides an insight into the basic principles of Micro Economics. It is also important for a student from Science stream or anyone for whom Economics is an unknown discipline. It is not possible to understand Economics of our daily life without having an insight into some basic principles of Micro Economics. Every year government announces its budget on last day of February. It is important for each and every citizen of India but its implications can be understood only if one has some basic knowledge of economics. Similarly, if one wants to take any decision, he needs to know cost benefit analysis. All of us need to take optimum decisions in given situations. Without having some knowledge of Economics, it is not possible. It has been a conscious effort that language of the book is extremely easy and examples taken are closely related to real life. It makes the book easy to understand and interesting to read.