I should have read your post first before replying, because this is actually a reasonable question. As you should be well aware, even with a finite currency, the interest on loans can be paid by debtors who do work and make money from that work. It's a constant circulation of money between hands which allows that to happen. Of course, if we have too many loans at the same time, it could be a problem. But the flaw in your premise here, is that it's unlikely that too many people will issue loans at the same time. And even if they did, the worste case scenario would be that some, but not all of those people, would default on their loans. This exact same "problem" will occur with any finite currency, and that's exactly why they keep printing new government money, to make sure there's enough in circulation to service the ever growing debts. So it's like never-ending a spiral of insanity in my opinion, but by having a finite currency you have naturally built in limits on how much debt can exist.