I'd say the just world or similar is the contemporary philosophical justification. Fancier framing is that economical position reflects marginal productivity be

I'd say the just world or similar is the contemporary philosophical justification. Fancier framing is that economical position reflects marginal productivity because of efficient markets. And "hard-work" and prosperity theology and genetical superiority and what have you. Marx's thesis is that a system of production/social organization produces ideology (or "superstructure") for it's justification and stability (materialism vs Hegel's idealism). The justifications (e.g. divine right) are probably always quite bad and not very universally accepted.