The Ricardian Machinery Question

The most important twenty pages in the prehistory of the automation debate arrived in 1821 as a chapter added to the third edition of David Ricardo’s Principles of Political Economy and Taxation. In it, Ricardo reversed his published position: having long held that machinery was an unambiguous benefit to all classes, he now declared he had been wrong. The substitution of machinery for human labor, he wrote, could be “very injurious to the interests of the class of labourers”—not as a temporary friction but as a structural feature of how the gains from mechanization are divided. The mechanism he identified is the conversion of circulating capital (the wage fund, advanced to workers) into fixed capital (the machine). The capitalist’s net revenue may be unchanged; the nation’s surplus undiminished; but the gross fund available to pay human labor has contracted, and the workers left without employment are not guaranteed reabsorption. This is