Although the interest received by the non-sacrifice savers is not clearly justifiable on either intrinsic or social grounds, it is not utterly lacking in moral sanctions. In the first place, we have not contended that the intrinsic factors of productivity and service are _certainly_ invalid morally. We have merely insisted that the moral worth of these titles has never been satisfactorily demonstrated. Possibly they have a greater and more definite efficacy than has yet been shown by their advocates. In more concrete terms, we admit that the productivity of capital and the service of the capitalist to the community, are possible and doubtful titles to interest. A doubtful title to property is, indeed, insufficient by itself. In the case of the interest receiver, however, the doubtful titles of productivity and service are reinforced by the fact of possession. Thus supplemented, they are sufficient to justify the non-sacrifice saver in giving himself the benefit of the doubt as regards the validity of his right to take interest. To be sure, this indefinite and uncertain claim would be overthrown by a more definite and positive title. But no such antagonistic title exists. Neither the consumer nor the labourer can show any conclusive reason why interest should go to him rather than to the capitalist. Hence the latter has at least a presumptive title. In the circumstances this is morally sufficient. To this justification by presumption must be added a justification by analogy. The non-sacrifice savers seem to be in about the same position as those other agents of production whose rewards are out of proportion to their sacrifices. For example; the labourer of superior native ability gets as much compensation for the same quality and quantity of work as his companion who has only ordinary ability; and the exceptionally intelligent business man stands in the same relation to his less efficient competitor; yet the sacrifices undergone by the former of each pair is less than that suffered by the latter. It would seem that if the more efficient men may properly take the same rewards as those who make larger sacrifices, the non-sacrifice capitalist might lawfully accept the same interest as the man whose saving involves some sacrifice. On this principle the lenders who would not have invested their money in a productive enterprise were nevertheless permitted by the moralists of the post-mediæval period to take advantage of the title of _lucrum cessans_. Although they had relinquished no opportunity of gain, nor made any sacrifice, they were put on the same moral level as sacrificing lenders, and were allowed to take the same interest.