In this volume, Marx explains how profit is spontaneously regulated by the market mechanism despite the anarchic character of social production as a whole. Marx shows the potential and the limitations of the market inhis famous reproduction schema. But he does much more besides. He demonstrates the possibility of crises, the disruptive effects of the circulation of fixed captial, and he lays the theoretical foundations for analysing unproductive labour. These are of crucial theoretical importance, retaining their relevance for revealing the anatomy of modern captialism. In addition, through the presentation of the turnover and the circuits of capital, Marx mounts a powerful critique of certain economic theories.