Marx on Piece Work

Let us now consider a little more closely the characteristic peculiarities of piece-wages. The quality of the labour is here controlled by the work itself, which must be of average perfection if the piece-price is to be paid in full. Piece-wages become, from this point of view, the most fruitful source of reductions of wages and capitalistic cheating.

They furnish to the capitalist an exact measure for the intensity of labour. Only the working-time which is embodied in a quantum of commodities determined beforehand and experimentally fixed, counts as socially necessary working time, and is paid as such.

Since the quality and intensity of the work are here controlled by the form of wage itself, superintendence of labour becomes in great part superfluous. …

Given piece-wage, it is naturally the personal interest of the labourers to strain his labour power as intensely as possible; this enables the capitalists to raise more easily the normal degree of intensity of labour.

– Karl Marx, Capital, Vol. 1, Kerr Edition, pages 605-606.