English edition. Das Kapital (Capital) is a truly revolutionary book; it was forged during the political and industrial revolutions of the nineteenth century and became the keystone of many Communist revolutions of the twentieth century. In this comprehensive and carefully footnoted analysis of capitalist economics and expression of his theory of class conflict, Karl Marx (1818-1883) relentlessly argues that the accumulation of capital can only be achieved by bourgeoisie exploitation of the working classes.