Discounting relativistic mass, yes. I'm not sure what the author's specific thoughts on that are; I was only pointing out my view, but your "debt is a hole in t

Discounting relativistic mass, yes. I'm not sure what the author's specific thoughts on that are; I was only pointing out my view, but your "debt is a hole in the wallet" is actually similar to what I'm proposing. The key is the object doesn't only not exist, it's missing. By the way, whoever upvoted my comment above, good one. It's not easy to wrap your brain around the implication. :)