In Marxist theory, society consists of two parts: the base (or substructure) and superstructure. The base comprises the forces and relations of production (e.g. employer–employee work conditions, the technical division of labour, and property relations) into which people enter to produce the necessities and amenities of life. The base determines society's other relationships and ideas to comprise its superstructure, including its culture, institutions, political power structures, roles, rituals, and state. While the relation of the two parts is not strictly unidirectional, as the superstructure often affects the base, the influence of the base is predominant. Marx and Engels warned against such economic determinism.