Heat, which would be a valuable resource in the kind of scenario where it stops being valued as currency. Dog food would also be quite useful. And of course t

Heat, which would be a valuable resource in the kind of scenario where it stops being valued as currency. Dog food would also be quite useful. And of course the wet kind would be better served warm, which would add to the desirability of paper. You could probably find uses for gold. But you'd have to waste a lot of paper to melt it down, so the most common ones would be things like 'doorstop' and 'blunt weapon'.