To revive the fortunes of socialism, the articulation of a credible and attractive alternative is absolutely essential. Offering an original synthesis of socialism and republicanism, The Constitution of Socialism discusses how society can move beyond capitalism. It outlines an institutional and political framework for a socialist future, in which collective decision-making about the use and allocation of resources directly responds to social interests. By means of institutional design, this study explores the feasibility criteria of post-capitalism and sketches the contours and features of a viable model of socialism.