The 'labour theory of value', implicit in Adam Smith and made explicit by David Ricardo, presented labour as the source of economic value, the prime mover of the market and the part of man's nature that is inherently priced. By harnessing labour we replace the old relation between nature and need with the new relation between man and his products. The translation of use into exchange, of nature into commodities, of personal relations into the disguises assumed by human power - all these changes that mystify the world, placing a veil between human beings and their fulfilment, and surrounding them with the will-o'-the-wisps engendered by their own malleable appetites, had their origin in the trick, the deception, the 'forging' that had given one man the power to extract labour from another. To