Write an essay explaining how do Smith, Ricardo and Marx theories parallel each other on regard to a capitalist economy.

Drawing on Smith, Ricardo, and Marx (including some of the secondary literature) explain how these classical political economists’ insights on the capitalist economy paralleled each other (despite their ideological differences) and how their analytical framework differed from the neoclassical one. Why can it be argued that Smith’s and Ricardo’s approaches are inconsistent with marginal productivity theory?