Explore "Capital, Volume One: The Process of Production of Capital" by Karl Marx on Textopian. Read with annotations and highlights.
That portion of the working day which merely produces an equivalent for the value paid by the capitalist for his labour-power, has, up to this point, been treated by us as a constant magnitude, and such in fact it is, under given conditions of production and at a given stage in the economic development of society. Beyond this, his necessary labour-time, the labourer, we saw, could continue to work for 2, 3, 4, 6, &c., hours. The rate of surplus-value and the length of the working day depended on the magnitude of this prolongation. Though the necessary labour-time was constant, we saw, on the other hand, that the total working day was variable. Now suppose we have a working day whose length, and whose apportionment between necessary labour and surplus labour, are given. Let the whole line a c, a–b–c represent, for example, a working day of 12 hours; the portion of a b 10 hours of necessary labour, and the portion b c 2 hours of surplus labour. How now can the production of surplus-value be increased, i.e., how can the surplus labour be prolonged, without, or independently of, any prolongation of a c?
Although the length of a c is given, b c appears to be capable of prolongation, if not by extension beyond its end c, which is also the end of the working day a c, yet, at all events, by pushing back its starting-point b in the direction of a. Assume that b'–b in the line ab'bc is equal to half of b c a–––b'–b––c or to one hour's labour-time. If now, in a c, the working day of 12 hours, we move the point b to b', b c becomes b' c; the surplus labour increases by one half, from 2 hours to 3 hours, although the working day remains as before at 12 hours. This extension of the surplus labour-time from b c to b' c, from 2 hours to 3 hours, is, however, evidently impossible, without a simultaneous contraction of the necessary labour-time from a b into a b', from 10 hours to 9 hours. The prolongation of the surplus labour would correspond to a shortening of the necessary labour; or a portion of the labour-time previously consumed, in reality, for the labourer's own benefit, would be converted into labour-time for the benefit of the capitalist. There would be an alteration, not in the length of the working day, but in its division into necessary labour-time and surplus labour- time.