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In page Equality of outcome:

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Bernard Shaw was one of the few socialist theorists to advocate complete economic equality of outcome right at the beginning of World War One.[12] The vast majority of socialists view an ideal economy as one where remuneration is at least somewhat proportional to the degree of effort and personal sacrifice expended by individuals in the productive process.[citation needed] This latter concept was expressed by Karl Marx's famous maxim: "To each according to his contribution".