In this introductory chapter, we give a subjective account of the content of Kolm's book "Macrojustice" (2005) that gave rise to the idea of organising in 2006 a round table where this book was discussed by different authors coming from a large variety of horizons: philosophers, economists, econometricans. We leave Serge-Christophe Kolm the task of presenting his theory in the first part of this book. Macrojustice is concerned about social justice proposing a comprehensive redistributive scheme. Of course, any distributive proposal always raises questions at the ethical, theoretical and practical levels. The questions are at the core of the discussions that are presented in this book, which is designed as a forum for multidisciplinary exchange.