It's an interesting thought, although I suspect that my where-should-I-put-it algorithm will turn out to behave noticeably differently when the item in question is borrowed, because the best place to put something does vary in response to that. (As a trivial example, a borrowed book should not be shelved in alphabetical order with the rest of my collection; instead it should go on a special pile of borrowed things, so that I'll remember that I have to give it back.)