When a society moves from allocating resources by custom and tradition to allocating resources by markets, they may be said to have undergone an indu… - Arnold Toynbee

The Comtists are right when they say that men's moral ideas are not fixed. The attitude of public opinion towards slavery was completely changed in twenty or thirty years. Still I am obliged to believe that such a moral revolution as the Comtists hope for is not possible within a reasonable space of time.

In the middle of the last century there was comparatively little movement of workmen from place to place; but Adam Smith's fierce attack on the law of settlement shows that migration was on the increase. The world was, in fact, on the eve of an industrial revolution; and it is interesting to remember that the two men who did most to bring it about, Adam Smith and James Watt, met, as I have mentioned, in Glasgow, when one was dreaming of the book, and the other of the invention, which were to introduce a new industrial age.

You must pursue facts for their own sake, but penetrated with a vivid sense of the problems of your own time. This is not a principle of perversion, but a principle of selection. You must have some principle of selection, and you could not have a better one than to pay special attention to the history of the social problems which are agitating the world now, for you may be sure that they are problems not of temporary but of lasting importance.