"Income Elasticity and Economic Development: Methods and Applications" is a specialized book that delves deeply into the methods for estimating income elasticity. This topic is closely linked to economic development, particularly regarding the reduction of income inequalities. In an era where the gap between the rich and the poor is widening, this book offers valuable insights and practical approaches for calculating income elasticity. Various methods based on widely used grouped data are presented. The techniques discussed in this work are applicable across a range of policy areas, in both developed and developing or underdeveloped countries. The book is aimed at professionals such as policy analysts, economists, business analysts, and market researchers who are interested in analyzing economic developments.