For I entreat the economists to question themselves for a moment in the silence of their hearts, far from the prejudices which disturb them, and regardless of the employments which occupy them or which they wait for, of the interests which they serve, of the votes which they covet, of the distinctions which tickle their vanity: let them tell me whether, hitherto, they have viewed the principle that all labor should leave an excess in connection with this series of premises and conclusions which we have elaborated, and whether they ever have understood these words to mean anything more than the right to speculate in values by manipulating supply and demand; whether it is not true that they affirm at once, on the one hand the progress of wealth and well-being, and consequently the measure of values, and on the other the arbitrariness of commercial transactions and the incommensurability of values,--the flattest of contradictions? Is it not because of this contradiction that we continually hear repeated in lectures, and read in the works on political economy, this absurd hypothesis: If THE PRICE OF ALL THINGS WAS DOUBLED. . . . . . ? As if the price of all things was not the proportion of things, and as if we could double a proportion, a relation, a law! Finally, is it not because of the proprietary and abnormal routine upheld by political economy that every one, in commerce, industry, the arts, and the State, on the pretended ground of services rendered to society, tends continually to exaggerate his importance, and solicits rewards, subsidies, large pensions, exorbitant fees: as if the reward of every service was not determined necessarily by the sum of its expenses? Why do not the economists, if they believe, as they appear to, that the labor of each should leave an excess, use all their influence in spreading this truth, so simple and so luminous: Each man's labor can buy only the value which it contains, and this value is proportional to the services of all other laborers? But here a last consideration presents itself, which I will explain in a few words. J. B. Say, who of all the economists has insisted the most strenuously upon the absolute indeterminability of value, is also the one who has taken the most pains to refute that idea. He, if I am not mistaken, is the author of the formula: EVERY PRODUCT IS WORTH WHAT IT COSTS; or, what amounts to the same thing: PRODUCTS ARE BOUGHT WITH PRODUCTS. This aphorism, which leads straight to equality, has been controverted since by other economists; we will examine in turn the affirmative and the negative.