Lecture III

When it is said today that the earth has so and so many hundred millions of inhabitants, this is not, actually entirely correct, for it can also be reckoned how many inhabitants the earth has according to how much work is done. Now we are perfectly justified in saying that since the last third of the eighteenth century man's power of labour has been fixed by the machines that have been increasingly produced. It can be reckoned, and reckoned pretty exactly, how many millions more men would have to be apportioned to the earth if all the work produced by machines were to be produced by men. The earth would have to have 500,000,000 more men. It can indeed be said that the earth today has not so many men if they are to be counted according to their two legs and their head, but according to labour power the earth has 500,000,000 more men; machines do duty as labour-power.