tell exactly how they will be divided. Two things about it, however, are _certain_ at least in their tendencies and potencies. The blacksmith is sure to get some part of the extra fruit of his neighbor's new push and spirit, while the tailor is sure to get as his own reward by much the larger part of the whole blessed 11. We must by no means omit to notice the logical inference from this instance, nor fail to make the proper inductive generalization from a sufficient number of similar instances. It is this: no man can make any essential improvement in any of the methods of producing material commodities, without at the same time benefiting other people as well as himself. Under natural law, which is no respecter of persons, he can by no possibility selfishly take to himself the entire fruits of his own growing skill and vigor. The only way in which he can gather in at all the fruits of these is to sell their proceeds in the open market. To broaden his own market for now better and more abundant goods he must offer them to everybody on somewhat better terms than formerly--and the better the terms the broader the market--and he can well afford to do this, because the goods now cost him less of irksome human effort. Every improvement in the production of commodities is precisely of that complexion. The issue of every invention, of every improved process of every kind, is, so far forth, a cheaper product. And this public gain follows, must follow, individual enterprise at single points, even when the great mass of exchangers remain at the old stage of sluggishness. Whatever increases at one point even, and _a fortiori_ at two points, the diversity of relative advantage as between any two exchangers, is of benefit to them both, and the greater this relative diversity becomes the greater the benefit to both.