The book ‘Economics of Demand-Supply Functions’ The first module covers micro-economics, its importance and limitations, concepts related to production, productivity relationships and factors market mechanism/economy. The second module covers demand, theory of demand, individual and market demand curves, elasticity of demand, consumer satisfaction, forecasting of demand. The module third covers equilibrium curve analysis related to consumer behaviour. The module four, covers production function, total, average and marginal product, law of variable quantity and law of quantity product. The fifth module covers factors such as average and marginal costs of production and cost curves, U and L shaped cost curves, internal and external economies and diseconomies. The sixth module covers perfect competition, firms , industries and its short-run and long-run equilibrium. These issues are discussed in depth and comprehensively in this book. This book will definitely be useful for Students, Academicians, Professor, Researchers, Scholars.