Talk:Monster Girl Encyclopedia World Guide I: Fallen Maidens/@comment-4407082-20150910085504/@comment-24851346-20150910200034

Do you particularly value paper? If no, then why do you keep it in your wallet?

Currency isn't used because its valuable, its used because it has an agreed upon worth, and can be used to measure the worth of other things. Back in ancient Mesopotamia wealth was measured in Grain.

And the various Demon Realms across the world seem to be in healthy trade with Monster Friendly states (human-run), or with other Monsters, at the very least in the sale of slaves which goes both ways (human and monster slaves) so they'd need some kind of currency. It could be coins, or printed money, or seashells.