Article dans une revue: In this article, I seek to sharpen the discussion about my book Capital in the twenty-first century, and to address some of the many issues raised by the very interesting papers that were put together by the editors of Basic Income Studies. I start by summarizing the multidimensional approach to capital and power that I develop in my book. I then clarify the role played by r>g in my analysis of wealth inequality. Finally, I discuss some of the implications of my analysis for optimal taxation; the relation between wealth, welfare and power; the basic income proposal; and the regulation of capital and property relations.