Society enjoys all, by the abundance of its use, its consumption; and it _enjoys all gratuitously_.

For as their effect is to diminish prices, it is evident that just so much of the price as is taken off by their intervention, renders the production in so far _gratuitous_.

There only remains the actual labor of man to be paid for; and the remainder, which is the result of the invention, is subtracted; at least after the invention has run through the cycle which I have just described as its destined course.

I send for a workman; he brings a saw with him; I pay him two francs for his day's labor, and he saws me twenty-five boards.

If the saw had not been invented, he would perhaps not have been able to make one board, and I would have paid him the same for his day's labor.