The economic laws will be found to act on the same principle, whether we take the case of a numerous agglomeration of men or of only two individuals, or even of a single individual condemned by circumstances to live in a state of isolation. Such an individual, if he could exist for some time in an isolated state, would be at once capitalist, employer, workman, producer, and consumer. The whole economic evolution would be accomplished in him. Observing each of the elements of which that evolution is made up—want, effort, satisfaction—gratuitous utility, and onerous utility—he would be enabled to form an idea of the entire mechanism, even when thus reduced to its greatest simplicity. One thing is obvious enough, that he could never confound what was gratuitous with what exacted efforts; for that would imply a contradiction in terms. He would know at once when a material or a force was furnished to him by nature without the co-operation of his labour, even when his own labour was assisted by natural agents, and thus rendered more productive. An isolated individual would never think of applying his own labour to the production of a commodity as long as he could procure it directly from nature. He would not travel a league to fetch water if he had a well at his door. For the same reason, whenever his own labour was called into requisition, he would endeavour to substitute for it, as much as he possibly could, the co-operation of natural agents. If he constructed a canoe, he would make it of the lightest materials, in order to take advantage of the specific gravity of water. He would furnish it with a sail, that the wind might save him the trouble of rowing, etc. [p197] In order to obtain in this way the co-operation of natural agent, tools and instruments would be wanted. And here the isolated individual would begin to calculate. He would ask himself this question: At present I obtain a satisfaction at the expense of a given effort: when I am in possession of the proper tool or instrument, shall I obtain the same satisfaction with less effort, taking into account the labour required for the construction of the instrument itself? No one will throw away his labour for the mere pleasure of throwing it away. Our supposed Robinson Crusoe, then, will be induced to set about constructing the instrument only if he sees clearly that, when completed, he will obtain an equal satisfaction at a smaller expense of effort, or a greater amount of satisfaction with the same effort.