• The product of mental labor - science - always stands far below its value, because the labor-time necessary to reproduce it has no relation at all to the labor-time required for its original production.

    Karl Marx: The product of mental labor - science - always stands far below its value, because the labor-time necessary to reproduce it has no relation at all to the labor-time required for its original production.
    "Economic and Philosophic Manuscripts of 1844". Book by Karl Marx, "Relative and Absolute Surplus Value", 1932.