There's a sense in which Marx does contribute to the fund of human knowledge, and we can no more dismiss him than we can [George] Hegel or [Jean-Jacques] Rousseau or [Baruch] Spinoza or [Charles] Darwin; you don't have to be a Darwinian to appreciate Darwin's views, and I don't have to be a Marxist to appreciate what is valid in a number of [Karl] Marx's writings-and Marx would call that a form of simple commodity production rather than capitalism.