Over twenty years, the ultra-rich have multiplied their wealth sixfold and cut their taxes to the point of being taxed less than the poorest. The situation is the same across the whole planet. How have states favoured the richest in order to keep them at home? How have they come to be so widely backed by an ideology that extols the merits of “trickle-down” economics? Why are the ultra-rich fighting at all costs against bills like the Zucman Tax, which would make it possible to tax their wealth and, according to its advocates, restore tax fairness on an international scale? And how, in the United States, the United Kingdom and Europe, is a new generation of millionaires taking the opposite stance from their elders and peers and trying to put an end to this inequality?