M. Say accuses Dr. Smith of having overlooked the value which is given to commodities by natural agents, and by machinery, because he considered that the value of all things was derived from the labour of man; but it does not appear to me, that this charge is made out; for Adam Smith no where under-values the services which these natural agents and machinery perform for us, but he very justly distinguishes the nature of the value which they add to commodities--they are serviceable to us, by increasing the abundance of productions, by making men richer, by adding to value in use; but as they perform their work gratuitously, as nothing is paid for the use of air, of heat, and of water, the assistance which they afford us, adds nothing to value in exchange. In the first chapter of the second book, M. Say himself gives a similar statement of value, for he says that "utility is the foundation of value, that commodities are only desirable, because they are in some way useful, but that their value depends not on their utility, not on the degree in which they are desired, but on the quantity of labour necessary to procure them." "The utility of a commodity thus understood, makes it an object of man's desire, makes him wish for it, and establishes a demand for it. When to obtain a thing, it is sufficient to desire it, it may be considered as an article of natural wealth, given to man in an unlimited quantity, and which he enjoys, without purchasing it by any sacrifice; such are the air, water, the light of the sun. If he obtained in this manner all the objects of his wants and desires, he would be infinitely rich: he would be in want of nothing. But unfortunately this is not the case; the greater part of the things which are convenient and agreeable to him, as well as those which are indispensably necessary in the social state, for which man seems to be specifically formed, are not given to him gratuitously; they could only exist by the exertion of certain labour, the employment of a certain capital, and, in many cases, by the use of land. These are obstacles in the way of gratuitous enjoyment; obstacles from which result a real expense of production; because we are obliged to pay for the assistance of these agents of production." "It is only when this utility has thus been communicated to a thing (viz. by industry, capital, and land,) that it is a production, _and that it has a value_. It is its utility which is the foundation of the demand for it, _but the sacrifices, and the charges necessary to obtain it, or in other words, its price_, limits the extent of this demand."