The inclusive book on 'Agricultural Economics and Extension' explains theoretical aspects and gives an in depth information of various concepts in a sequenced manner. This book consists of five units, such as Agricultural Economics, Agricultural Extension and Computer applications, respectively.This book has also brought out Multiple Choice Questions in each chapter. Agricultural Economics consists of principles of economics, law of diminishing marginal utility, Law of Equi - marginal utility, Indifference curve analysis, Law of demand, consumer's surplus, production, factors of production, supply, Factor-Product relationship, Factor-Factor relationship, Product-Product relationship, Law of Equi-Marginal Returns, Cost concepts, Balance sheet, Type and Systems of farming, Farm budgeting and Depreciation, Agricultural Marketing, market Classification, Marketed surplus, Price spread, market integration, Agricultural Finance includes Classification of credit, Nationalisation of Banks, Regional Rural Banks(RRB),National Bank for Agriculture and Rural Development (NABARD), Reserve bank of India, 3 R's, 5 C's and 7 Ps of credit, Lead Bank Scheme, Crop Insurance schemes. Agricultural Extension deals with the concepts and importance of Extension Education and Sociology, Rural development programmes and Extension teaching methods and contains Communication principles, Cyber Extension, Adoption and Diffusion of Innovation and Capacity building for Extension personnel, farmers, women and youth. Unit III - Computer applications deals with Input Devices, Output Devices, Memory, Hardware Software, Classification, Booting, computer Virus, Operating system, DOS commands, Types of files Windows, MS Word, MS Excel, MS Power Point, MS Access, Computer Programming, Algorithm, Programming language, BASIC, FOTRAN, C language and Bioinformatics.This book is designed for those students who are appearing for various competitive examinations in agricultural and allied sciences