A lei de Say na versão de James Mill

"When goods are carried to market what is wanted is somebody to buy. But to buy, one must have the wherewithal to pay. It is obviously therefore the collective means of payment which exist in the whole nation constitute the entire market of the nation. But wherein consist the collective means of payment of the whole nation? Do they not consist in its annual produce, in the annual revenue of the general mass of inhabitants? But if a nation's power of purchasing is exactly measured by its annual produce, as it undoubtedly is; the more you increase the annual produce, the more by that very act you extend the national market, the power of purchasing and the actual purchases of the nation…. Thus it appears that the demand of a nation is always equal to the produce of a nation. This indeed must be so; for what is the demand of a nation? The demand of a nation is exactly its power of purchasing. But what is its power of purchasing? The extent undoubtedly of its annual produce. The extent of its demand therefore and the extent of its supply are always exactly commensurate."
James Mill, "On the Overproduction and Underconsumption Fallacies." Edited by George Reisman, a publication of The Jefferson School of philosophy, Economics, and Psychology — 2000.