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Socialism refers to a broad set of economic theories of social organization advocating state or collective ownership and administration of the means of production and distribution of goods, and the creation of an egalitarian society. Modern socialism originated in the late nineteenth-century working class political movement. Karl Marx posited that socialism would be achieved via class struggle and a proletarian revolution which represents the transitional stage between capitalism and communism.

Socialists mainly share the belief that capitalism unfairly concentrates power and wealth among a small segment of society that controls capital and creates an unequal society. All socialists advocate the creation of an egalitarian society, in which wealth and power are distributed more evenly, although there is considerable disagreement among socialists over how, and to what extent this could be achieved.

Socialism is not a discrete philosophy of fixed doctrine and program; its branches advocate a degree of social interventionism and economic rationalization, sometimes opposing each other. Another dividing feature of the socialist movement is the split on how a socialist economy should be established between the reformists and the revolutionaries. Some socialists advocate complete nationalization of the means of production, distribution, and exchange; while others advocate state control of capital within the framework of a market economy. Social democrats propose selective nationalization of key national industries in mixed economies combined with tax-funded welfare programs; Libertarian socialism (which includes Socialist Anarchism and Libertarian Marxism) rejects state control and ownership of the economy altogether and advocates direct collective ownership of the means of production via co-operative workers' councils and workplace democracy.

In the 1970s and the 1980s, Yugoslavian, Hungarian, Polish and Chinese Communists instituted various forms of market socialism combining co-operative and State ownership models with the free market exchange. This is unlike the earlier theoretical market socialist proposal put forth by Oskar Lange in that it allows market forces, rather than central planners to guide production and exchange.[6] Anarcho-syndicalists, Luxemburgists (such as those in the Socialist Party USA) and some elements of the United States New Left favor decentralized collective ownership in the form of cooperatives or workers' councils.