I believe the word you seek is usury. 0% usury is optimal but indeed powers realized the benefit of longterm non-zero usury in either positive/negative % directions.
I’ve just learnt a new word.. never heard it before! 🙋♂️ Nostr really is where the signal is at!
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Do not go by the modern definition. Ponder over what came before Aristotle's definition of usury and you will see alpha nobody else dreams possible.
Thanks for the wisdom…