Its more than that. Its about understanding that efficiency and equity are positively related. Consider, for example, education. That should fullfil the human capital investment role. Indeed, orthodox and radical schools agree that such a role exists. However, the socialist is able to also refer to the consequences of hierarchy. They'd acknowledge that such hierarchy isn't simply based on 'division of labour' criteria (in order to maximise productivity). Instead, its about controlling labour militancy (and therefore maintaining economic rents). Education then has the additional role of legitimising that hierarchy (e.g. you do not attend university to increase your productivity, you attend to achieve the certification required to be considered for the 'good jobs'). This will then suggest the social benefits from education are not fully realised (e.g. see Britain where its tertiary education investments have reduced social mobility, given it provides extra opportunities to lower ability youngsters from high income backgrounds). To deliver optimal education we'd need a socialist economy

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“No attempt at ethical or social seduction can eradicate from my heart a deep burning hatred for the Tory Party . . . So far as I am concerned they are lower than vermin”