Karl Marx introduced the concept of historical materialism into the study of world historical development. In his conception, the economic conditions and dominant modes of production determined the structure of society at that point. In his view five successive stages in the development of material conditions would occur in Western Europe. The first stage was primitive communism where property was shared and there was no concept of "leadership". This progressed to a slave society where the idea of class emerged and the State developed. Feudalism was characterized by an aristocracy working in partnership with a theocracy and the emergence of the nation-state. Capitalism appeared after the bourgeois revolution when the capitalists (or their merchant predecessors) overthrew the feudal system and established a market economy, with