"The prosperity of a people depends upon such facts as the natural wealth of the country in which they live, their social discipline and industrial character, the result of generations, of centuries, it may be, of tradition. In addition it depends upon a special technical capacity for such-and-such a manufacture, a special aptitude for meeting the peculiarities of such-and-such a market, the efficient equipment of elaborately constructed workshops, and the existence of a population trained to given trades."