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Suppose the working day consists of 6 hours of necessary labour, and 6 hours of surplus-labour. Then the free labourer gives the capitalist every week 6 × 6 or 36 hours of surplus-labour. It is the same as if he worked 3 days in the week for himself, and 8 days in the week gratis for the capitalist. But this is not evident on the surface. Surplus-labour and necessary labour glide one into the other. I can, therefore, express the same relationship by saying, e.g., that the labourer in every minute works 30 seconds for himself, and 30 for the capitalist, etc. It is otherwise with the corvée. The necessary labour which the Wallachian peasant does for his own maintenance is distinctly marked off from his surplus-labour on behalf of the Boyard. The one he does on his own field, the other on the seignorial estate. Both parts of the labour-time exist, therefore, independently, side by side one with the other. In the corvée the surplus-labour is accurately marked off from the necessary labour. This, however, can make no difference with regard to the quantitative relation of surplus-labour to necessary labour. Three days' surplus-labour in the week remain three days that yield no equivalent to the labourer himself, whether it be called corvée or wage-labour. But in the capitalist the greed for surplus-labour appears in the straining after an unlimited extension of the working day, in the Boyard more simply in a direct hunting after days of corvée.[10]

in the equation of value, the equivalent figures exclusively as a simple quantity of some article, of some use-value, has misled Bailey, as also many others, both before and after him, into seeing, in the expression of value, merely a quantitative relation. The truth being, that when a commodity acts as equivalent, no quantitative determination of its value is expressed.