 Marxism as a philosophy of human nature stresses the centrality of work in the creation of human nature itself and human self-understanding.  Both the changing historical relations between human work and nature, and the relations of humans to each other in the production and distribution of goods to meet material needs construct human nature differently in different historical periods: nomadic humans are different than agrarian or industrial humans. Marxism as a philosophy of history and social change highlights the social relations of work in different economic modes of production in its analysis of social inequalities and exploitation, including relations of domination such as racism and sexism. (Marx 1844, 1950, 1906–9; Marx and Engels 1848, 1850; Engels 1942). Within capitalism, the system they most analyzed, the logic of profit drives the bourgeois class into developing the productive forces of land, labor and capital by expanding markets, turning land into a commodity and forcing the working classes from feudal and independent agrarian production into wage labor. Marx and Engels argue that turning all labor into a commodity to be bought and sold not only alienates workers by taking the power of production away from them, it also collectivizes workers into factories and mass assembly lines. This provides the opportunity for workers to unite against the capitalists and to demand the collectivization of property, i.e., socialism, or communism.