Karl Marx (1818–1883) is best known not as a philosopher but as a revolutionary communist, whose works inspired the foundation of many communist regimes in the twentieth century. It is hard to think of many who have had as much influence in the creation of the modern world. Trained as a philosopher, Marx turned away from philosophy in his mid-twenties, towards economics and politics. However, in addition to his overtly philosophical early work, his later writings have many points of contact with contemporary philosophical debates, especially in the philosophy of history and the social sciences, and in moral and political philosophy. Historical materialism — Marx’s theory of history — is centered around the idea that forms of society rise and fall as they further and then impede the development of human productive power. Marx sees the historical process as proceeding through a necessary series of modes of production, characterized by class struggle, culminating in communism. Marx’s economic analysis of capitalism is based on his version of the labour theory of value, and includes the analysis of capitalist profit as the extraction of surplus value from the exploited proletariat. The analysis of history and economics come together in Marx’s prediction of the inevitable economic breakdown of capitalism, to be replaced by communism. However Marx refused to speculate in detail about the nature of communism, arguing that it would arise through historical processes, and was not the realisation of a pre-determined moral ideal.