Perhaps the best known recent statement of the opinion that interest is inevitable, appears in Professor Irving Fisher's "The Rate of Interest."[144] While he does not assert explicitly that sufficient capital would not be provided without interest, and even admits that in certain circumstances interest might disappear, the general logic and implications of his argument are decidedly against the supposition that society could ever get along without interest. He lays such stress upon the factor of "impatience," i.e., man's unwillingness to wait for future goods, as to suggest strongly that other causes of interest, and the number of savers free from "impatience," are quite insignificant. Now, if "impatience" were the only cause of interest the latter must continue as long as "impatience" continues; and if practically all savers, actual and possible, are completely dominated by "impatience" the abolition of interest would be socially disastrous. However, neither of these assumptions is demonstrable. We have just seen that the present rate of interest has other causes than "impatience"; that a large proportion of savers insist upon getting the present rate, not because they require it to offset their "impatience," but simply because they can obtain it, and because they prefer it to the lower rate. Therefore, the mere existence of the present rate does not prove it to be necessary. By the same argument it is evident that the existence of any interest does not demonstrate the necessity of some interest. In the second place, the number of savers, present and prospective, whose "impatience" is so weak as to permit them to save without interest, is probably greater than the average reader of Professor Fisher's pages is led to assume. The question whether interest is necessary cannot be answered by reference to the general fact of human "impatience"; it demands a preliminary analysis of the extent to which "impatience" affects the different classes of savers.