Indeed, if we look back into the past history of mankind, we shall find that there are two systems other than that of wages, by which the conformity of labour to the requisite directions of ability, not only might be, but actually has been secured.
One of these is the corvee system prevalent in the Middle Ages.

The other system is that of slavery.

Under the corvee system, peasants were the proprietors of the plots of ground on which they lived, and were thus able to maintain themselves by working at their own discretion; but they were compelled by their tenure to place a certain part of their time at the disposal of their feudal superior, and to work according to his orders.

If only a number of otherwise independent peasants could be forced to give enough of their time to the proprietor of a factory to-day, the entire use of wage-capital would in his case be gone.

The same thing is true of slavery.