structural:summarization, information:classification
Socialist theory

As per Noam Chomsky, analysis of the psychological implications of wage slavery goes back to the Age of Enlightenment era. In his 1791 book On the Limits of State Action, liberal thinker Wilhelm von Humboldt posited that "whatever does not spring from a man's free choice, or is only the result of instruction and guidance, does not enter into his very nature; he does not perform it with truly human energies, but merely with mechanical exactness" and so when the labourer works under external control "we may admire what he does, but we despise what he is". Both the Milgram and Stanford experiments have been found useful in the psychological study of wage-based workplace relations.