Its purely economic deductions are dominated throughout by the theory of surplus-value.
They must content themselves with what Kropotkine has taught them about Marx's "surplus-value."
The conditions of direct exploitation and those of the realisation of surplus-value are not identical.
Deducting these there remains the net or surplus-product, in which the surplus-value lies.
As soon as the available quantity of surplus-value has been materialised in commodities, surplus-value has been produced.
This surplus-value is the key to the whole present economic organization of society.
The capitalist obtains this surplus-value owing to his monopoly of the means of production.
The product of the other seven hours of his labor, his surplus or unpaid labor, is surplus product or surplus-value.
Is not the interest which prompts the formation of a concept of surplus-value a moral interest, or social if it is preferred?
The wealth producers are exploited by a class whose source of income is the surplus-value extracted from the workers.