Great piece! Bentham's Defence of Usury, as you know, corrects Aristotle by pointing out that in borrowing a daric one enables oneself to generate the 'offspring' (τοκος) by buying a cow that, unlike money, can give birth. But still there is something paradoxical in this, and an apparent violation of the PSR. The thought is this: you were able to raise the calf because you borrowed, but you were only able to borrow because you could raise the calf. There is an explanatory circle here, and the metaphysical fishiness of the whole affair was enough to provoke many Renaissance commentators to suppose that profiting from debt involved some sort of violation of the order of nature.