Hi,
I was thinking of this and about the Tomistic argument against interest.
I think what changed is the nature of money and of lending.
The Latin Catholic sources agree that an investor is entitled to have a return over and above of the original amount invested because of the risk he/she took in investing.
Well, modern lenders can claim to be taking risks when lending money as their main business.
On the other hand, money borrowed is a good the borrower is using for his/her own benefit. In that light, interest could be seen as a "rental fee" paid for the good being used.
If I rent a house, I am expected to pay the rent and also to return the house to its owner in the same conditions I received it.
Likewise, if I rent money, I am expected to pay the rent (that is, the interest) and also to return the money (that is, the principal) to its owner.
Reasonable wear and tear in the case of the house can be analogous to devaluation because of inflation of the principal.
But as I said, interest must be reasonable, but then again, so should rents be and a 3 bedroom apartment next door to my home goes for over $2,800 a month. We live in an unreasonable world.
Shalom,
Memo