Thomas Aquinas’ point that charging interest on a mutuum loan (usury) involves selling what does not exist

Thomas Aquinas’ point that charging interest on a mutuum loan (usury) involves selling what does not exist

[The following proposition is condemned as erroneous:] Since ready cash is more valuable than that to be paid, and since there is no one who does not consider ready cash of greater worth than future cash, a creditor can demand something beyond the principal from the borrower, and for this reason be excused from usury. – Various Errors on Moral Subjects (II), Pope Innocent XI by decree of the Holy Office, March 4, 1679 (Denzinger)

It has also been established that Magisterial silence on a moral or doctrinal question does not constitute approval. Those who insist that the Magisterium has approved the title of lucrum cessans at all, let alone that the proposed title can be interpreted as a license to recover opportunity costs in for-profit mutuum loans as opposed to charitable loans to the poor where there is no intention of recovering even the principal from those who cannot afford it, are simply wrong. (mehr …)