Under the circumstances defined, if Teneriffe and Gran Canaria disappeared, or if their inhabitants ceased to care for carpentry, clothing, or shoes, the people of Lanzerote must starve. But if they wish to buy, then the Lanzerotians, by "cultivating" the buyers, indirectly favour the cultivation of the produce of those buyers. Thus, if the question is asked whether the labour employed in manufacture in Lanzerote is "productive" or "unproductive" there can be only one reply. If anybody will exchange vital capital, or that which can be exchanged for vital capital, for Lanzerote goods, it is productive; if not, it is unproductive. In the case of the manufacturer, the dependence of labour upon capital is still more intimate than in that of the herdsman or agriculturist. When the latter are once started they can go on, without troubling themselves about the existence of any other people. But the manufacturer depends on pre-existing capital, not only at the [166] beginning, but at the end of his operations. However great the expenditure of his labour and of his skill, the result, for the purpose of maintaining his existence, is just the same as if he had done nothing, unless there is a customer able and willing to exchange food-stuffs for that which his labour and skill have achieved. There is another point concerning which it is very necessary to have clear ideas. Suppose a carpenter in Lanzerote to be engaged in making chests of drawers. Let us suppose that a, the timber, and b, the grain and meat needful for the man's sustenance until he can finish a chest of drawers, have to be paid for by that chest. Then the capital with which he starts is represented by a + b. He could not start at all unless he had it; day by day, he must destroy more or less of the substance and of the general adaptability of a in order to work it up into the special forms needed to constitute the chest of drawers; and, day by day, he must use up at least so much of b as will replace his loss of vital capital by the work of that day. Suppose it takes the carpenter and his workmen ten days to saw up the timber, to plane the boards, and to give them the shape and size proper for the various parts of the chest of drawers. And suppose that he then offers his heap of boards to the advancer of a + b as an equivalent for the wood + ten days' supply of vital capital? The latter will surely say: "No. [167] I did not ask for a heap of boards. I asked for a chest of drawers. Up to this time, so far as I am concerned, you have done nothing and are as much in my debt as ever." And if the carpenter maintained that he had "virtually" created two-thirds of a chest of drawers, inasmuch as it would take only five days more to put together the pieces of wood, and that the heap of boards ought to be accepted as the equivalent of two-thirds of his debt, I am afraid the creditor would regard him as little better than an impudent swindler. It