_This Fact heretofore Underestimated._--To the writers who have cited this familiar fact it appears to require merely a partial amendment of the general proposition that a high rate of interest insures more saving than a low one, and the inference which one naturally draws from this supposed fact is that growing wealth, as is still supposed, reduces the incentive for the accumulation of more wealth. Such an accumulation is an essential part of general progress and is practically necessary for sustaining the rate of wages. Here, then, if this supposition is true, we might see an important influence tending to bring progress to a standstill. Great wealth as the result of progress, a reduced motive for acquiring still further wealth, a retarding of progress--such would be the sequence. Dynamics would thus be, in a very important respect, self-retarding if not self-halting. _Future Standards of Living the Important Element._--The actual fact, as we may venture to affirm, is that the standards of living which need to be maintained in the future are the all-important element in the case. To the laboring man it is necessary to avoid starvation or the workhouse; to the well-paid artisan it seems necessary to do this and to make for his children a provision which will keep them in the same class with himself. To the capitalist who by successful business has raised himself above the artisan class it seems necessary to keep his children above the rank from which he has lifted the family; and the same principle applies to all the wealthier classes. The tenacity with which a man holds to a station in life outweighs his desire to add to his own present luxuries, and his ambition to keep his children in a certain station far outweighs his desire to add to their present luxuries. _The Importance of Future Standards not affected by the Fact that Men differ in Altruism._--This does not at all raise the question how many people care as much for their children as they do for themselves. That is not the principle at issue. _In so far as men do care for their children_ the end they seek for them is to enable them to avoid what seems like a disaster, rather than to make positive gains in the way of comfortable living. Even in the case of those who have little altruism, such provision as they make for descendants is inspired by the desire to keep them within a certain class more than by any computation of how many comforts or luxuries a surplus income of any amount might give them. Whatever provision for children a selfish or dull person makes is dictated by the same motive that incites him to make provision for his own future, and in both cases it is chiefly the maintenance of a standard that he usually has in mind.