we assume that human nature is sound, then the only practical conclusion is that external nature must be coerced into harmony with man's desires and made to yield more and more for their satisfaction. This is the theory of the modern industrial spirit in its wild pursuit of wealth and luxury.
Even if the wants of the individual never expanded at all, it is quite obvious that an indefinite increase in the number of individuals in any locality would, sooner or later, result in scarcity and bring them into conflict with nature, and therefore into conflict with one another. That human populations are physiologically capable of indefinite increase, if time be allowed, is admitted, and must be admitted by anyone who has given the slightest attention to the subject. Among the non-economizing animals and plants, it is not the limits of their procreative power but the limits of subsistence which determine their numbers. Neither is it lack of procreative power which limits numbers in the case of man, the economic animal. With him also it is a question of subsistence, but of subsistence according to some standard. Being gifted with economic foresight, he will not multiply beyond the point where he can maintain that standard of life which he considers decent. But—and this is to be especially noted—so powerful are his procreative and domestic instincts that he will multiply up to the point where it is difficult to maintain whatever standard he has. Whether his standard of living be high or low to begin with, the multiplication of numbers will be carried to the point where he is in danger of being forced down to a lower standard. In other words, it will always be hard for us to make as good a living as we think we ought to have. Unsatisfied desires, or economic scarcity, which means the same thing, are therefore inevitable. It is a condition from which there is no possible escape. The cause lies deeper than forms of social organization: it grows out of the relation of man and nature.
THE INTERNAL CONFLICT OF INTERESTS
These considerations reveal a third form of conflict—perhaps it ought to be called the second—a conflict of interests within the individual himself. If the procreative and domestic instincts are freely gratified, there will inevitably result a scarcity of means of
