Condillac, Galiani, and Graslin start from the exchange of utilities as the subjective and positive foundation of all values; all that satisfies a need, has, therefore, a value, and any transformation or transference that makes it possible to satisfy a greater number of needs constitutes an increase of value: it is this increase that makes it possible to remunerate workers, by giving them an amount, deducted from this increase, which is equivalent to their subsistence.