In his later years, and especially in Capital, Marx stopped using the term "alienation/" a term he used frequently in the 1840s and the 1850s. In his attempts to redefine and reconfigure the concept of alienation as the central experience of capitalist subjects, Marx amplified it with the concepts of commodity fetishism and machine labor. In this amplification, the concept of alienation comes to define a world determined solely by economics. The illusions produced by capitalist making come to determine the possible range of human thinking. However, commodity fetishism and machine labor are not so much new concepts as developments of the discourse of alienation in a new terrain, in a different world from the one described by bourgeois political theory. On this new terrain, Marx reintroduces a classic philosophical theme as a counterpoint to the unalloyed worship of labor characteristic of bourgeois political theory: the idea of social and personal illness consequent upon imbalances in economic life.