 Allen Wood (1972) is perhaps the leading advocate of the view that Marx did not believe that capitalism is unjust. Wood argues that Marx takes this approach because his general theoretical approach excludes any trans-epochal standpoint from which one can comment on the justice of an economic system. Even though it is acceptable to criticise particular behaviour from within an economic structure as unjust (and theft under capitalism would be an example) it is not possible to criticise capitalism as a whole. This is a consequence of Marx’s analysis of the role of ideas of justice from within historical materialism. Marx claims that juridical institutions are part of the superstructure, and that ideas of justice are ideological. Accordingly, the role of both the superstructure and ideology, in the functionalist reading of historical materialism adopted here, is to stabilise the economic structure. Consequently, to state that something is just under capitalism is simply a judgement that it will tend to have the effect of advancing capitalism. According to Marx, in any society the ruling ideas are those of the ruling class; the core of the theory of ideology.