[Footnote 3: Das Recht auf den Arbeiterstrag. See the Abbé Hohoff in Démocratie Chrétienne, Sept. 1898, p. 284.]
No such conclusion, however, can be properly drawn from the mediæval teaching. The whole discussion on usury turned on the distinction which was drawn between things of which the use could be transferred without the ownership, and things of which the use could not be so transferred. In the former category were placed all things which could be used, either by way of enjoyment or employment for productive purposes, without being destroyed in the process; and in the latter all things of which the use or employment involved the destruction.
With regard to income derived from the former, no difficulty was ever felt; a farm or a house might be let at a rent without any question, the return received being universally regarded as one of the legitimate fruits of the ownership of the thing. With regard to the latter, however, a difficulty did arise, because it was felt that a so-called loan of such goods was, when analysed, in reality a sale, and that therefore any increase which the goods produced was in reality the property, not of the lender, but of the borrower. That money was in all cases sterile was never suggested; on the contrary, it was admitted that it might produce a profit if wisely and prudently employed in industry or commerce; but it was felt that such an increase, when it took place, was the rightful property of the owner of the money. But when money was lent, the owner of this money was the borrower, and therefore, when money which was lent was employed in such a way as to produce a profit, that profit belonged to the borrower, not the lender. In this way the schoolmen were strictly logical; they fully admitted that wealth could produce wealth; but they insisted that that additional wealth should accrue to the owner of the wealth that produced it.
The fact is, as Böhm-Bawerk has pointed out, that the question of the productivity of capital was never discussed by the mediæval schoolmen, for the simple reason that it was so obvious. The justice of receiving an income from an infungible thing which was temporarily lent by its owner, was discussed and supported; but the justice of the owner of such a thing receiving an income from the thing so long as it remained in his own possession was never discussed, because it was universally admitted.[1] It is perfectly correct to say that the problems which have perplexed modern writers as to the justice of receiving an unearned income from one's property never occurred to the scholastics; such problems can only arise when the institution of private property comes to be questioned; and private property was the keystone of the whole scholastic economic conception. In other words, the justice of a reward for capital was admitted because it was unquestioned.
[Footnote 1: Capital and Interest, p. 39.]
The question that caused difficulty was whether money could be considered a form of capital. At the present day, when the opportunities of industrial investment are wider than they ever were before, the principal use to which money is put is the financing of industrial enterprises; but in the Middle Ages this was not the case, precisely because the opportunities of profitable investment were so few. This is the reason why the mediæval writers did not find it necessary to discuss in detail the rights of the owner of money who used it for productive purposes. But of the justice of a profit being reaped when money was actually so employed there was no doubt at all. As we have seen, the borrower of a sum of money might reap a profit from its wise employment; there was no question about the justice of taking such a profit; and the only matter in dispute was whether that profit should belong to the borrower or the lender of the money. This dispute was decided in favour of the borrower on the ground that, according to the true nature of the contract of mutuum, the money was his property. It was, therefore, never doubted that even money might produce a profit for its owner. The only difference between infungible goods and money was that, in the case of the former, the use might be transferred apart from the property, whereas, in the case of the latter, it could not be so transferred.
The recognition of the title lucrum cessans as a ground for remuneration clearly implies the recognition of the legitimacy of the owner of money deriving a profit from its use; and the slowness of the scholastics to admit this title was precisely because of the rarity of opportunities for so employing money in the earlier Middle Ages. The nature of capital was clearly understood; but the possibility of money constituting capital arose only with the extension of commerce and the growth of profitable investments. Those scholastics who strove to abolish or to limit the recognition of lucrum cessans as a ground for remuneration did not deny the productivity of capital, but simply thought the money had not at that time acquired the characteristics of capital.[1]
[Footnote 1: See Ashley, op. cit., vol. i. pt. ii. pp. 434-9.]
If there were any doubt about the fact that the scholastics recognised the legitimacy of unearned income, it would be dispelled by an understanding of their teaching on rents and partnership, in the former of which they distinctly acknowledged the right to draw an unearned income from one's land, and in the latter of which they acknowledged the same right in regard to one's money.[1]
[Footnote 1: On this discussion see Ashley, Economic History, vol. i. pt. ii. pp. 427 et seq.; Rambaud, Histoire, pp. 57 et seq.; Funk, Zins und Wucher; Arnold, Zur Geschichte des Eigenthums, pp. 92 et seq.; Böhm-Bawerk, Capital and Interest (Eng. trans.), pp. 1-39.]