The hypothesis has been put in an extreme form in order to depict the situation as vividly as possible. But such a condition as the complete failure of the foreigner's surplus does not seem to-day so preposterous as it might have done five years ago. For that surplus has shrunk enormously and great areas that once contributed to feeding us can do so no longer. Those areas already include Russia, Siberia, the Balkans, and a large part of the Near and Far East. What we are practically concerned with, of course, is not the immediate disappearance of that surplus on which our industries depend, but the degree to which its reduction increases for us the cost of food, and so intensifies all the social problems that arise out of an increasing cost of living. Let the standard alike of consumption and production of our overseas white customers decline to the standard of India and China, and our foreign trade would correspondingly decrease; the decline in the world's production of food would mean that much less for us; it would reduce the volume of our trade, or in terms of our own products, cost that much more; this in turn would increase the cost of our manufactures, create an economic situation which one could describe with infinite technical complexity, but which, however technical and complex that description were made, would finally come to this--that our own toil would become less productive. That is a relatively new situation. In the youth of men now living, these islands with their twenty-five or thirty million population were, so far as vital needs are concerned, self-sufficing. What will be the situation when the children now growing up in our homes become members of a British population which may number fifty, sixty, or seventy millions? (Germany's population, which, at the outbreak of war, was nearly seventy millions, was in 1870 a good deal less than the present population of Great Britain.) Moreover, the problem is affected by what is perhaps the most important economic change in the world since the industrial revolution, namely the alteration in the ratio of the exchange value of manufactures and food--the shift over of advantage in exchange from the side of the industrialist and manufacturer to the side of the producer of food.