Gabriel Pierre Deville, Socialism, Revolution and Internationalism
“ But, even when the laborer gets a value equal to the value of his power, he furnishes a value greater than that which he receives. The duration of labor required for a given wage, regularly exceeds the time necessarily occupied by the laborer in adding to the value of the means of production consumed, a value equal to that wage; and the labor thus furnished over and above that which represents the equivalent of what the laborer gets, constitutes surplus-labor. Surplus-labor then is unpaid labor. ”
