Which process, judged by all things that men desire, gives the better result, the physical force of blood and iron which we see, or the intellectual or psychic force which we cannot see? The principle which operates in the limited fashion which I have indicated, operates with no less force in the larger domain of modern international politics. The wealth of the world is not represented by a fixed amount of gold or money now in the possession of one Power, and now in the possession of another, but depends on all the unchecked multiple activities of a community for the time being. Check that activity, whether by imposing tribute, or disadvantageous commercial conditions, or an unwelcome administration which sets up sterile political agitation, and you get less wealth—less wealth for the conqueror, as well as less for the conquered. The broadest statement of the case is that all experience—especially the experience indicated in the last chapter—shows that in trade by free consent, carrying mutual benefit, we get larger results for effort expended than in the exercise of physical force, which attempts to exact advantage for one party at the expense of the other. I am not arguing over again the thesis of the first part of this book; but, as we shall see presently, the general principle of the diminishing factor of physical force in the affairs of the world carries with it a psychological change in human nature which modifies radically our impulses to sheer physical conflict. What it is important just now to keep in mind, is the incalculable intensification of this diminution of physical force by our mechanical development. The principle was obviously less true for Rome than it is for Great Britain or America: Rome, however imperfectly, lived largely by tribute. The sheer mechanical development of the modern world has rendered tribute in the Roman sense impossible. Rome did not have to create markets and find a field for the employment of her capital. We do. What result does this carry? Rome could afford to be relatively indifferent to the prosperity of her subject territory. We cannot. If the territory is not prosperous we have no market, and we have no field for our investments, and that is why we are checked at every point from doing what Rome was able to do. You can to some extent exact tribute by force; you cannot compel a man to buy your goods by force if he does not want them, and has not got the money to pay for them. Now, the difference which we see here has been brought about by the interaction of a whole series of mechanical changes—printing, gunpowder, steam, electricity, improved means of communication. It is the last-named which has mainly created the fact of credit. Now, credit is merely an extension of the use of money, and we can no more shake off the domination of the one than we can that of the other. We have seen that the bloodiest despot is himself the slave of money, in the sense that he is compelled to employ it. In the same way no physical force can, in the modern world, set at nought the force of credit.93 It is no more possible for a great people of the modern world to live without credit than without money, of which it is a part. Do we not here get an illustration of the fact that intangible economic forces are setting at nought the force of arms?
One of the curiosities of this mechanical development, with its deep-seated psychological results, is the general failure to realize the real bearings of each step therein. Printing was regarded, in the first instance, as merely a newfangled process which threw a great many copying scribes and monks out of employment. Who realized that in the simple invention of printing there was the liberation of a force greater than the power of kings? It is only here and there that we find an isolated thinker having a glimmering of the political bearing of such inventions of the conception of the great truth that the more man succeeds in his struggle with nature, the less must be the role of physical force between men, for the reason that human society has become, with each success in the struggle against nature, a completer organism. That is to say, that the interdependence of the parts has been increased, and that the possibility of one part injuring another without injury to itself, has been diminished. Each part is more dependent on the other parts, and the impulses to injury, therefore, must in the nature of things be diminished. And that fact must, and does, daily redirect human pugnacity. And it is noteworthy that perhaps the best service which the improvement of the instruments of man’s struggle with nature performs is the improvement of human relations. Machinery and the steam-engine have done something more than make fortunes for manufacturers: they have abolished human slavery, as Aristotle foresaw they would. It was impossible for men in the mass to be other than superstitious and irrational until they had the printed book.94 “Roads that are formed for the circulation of wealth become channels for the circulation of ideas, and render possible that simultaneous action upon which all liberty
