"Our notes people call money are just bits of paper with a pretty picture on it, it's got no capital value either."
1st, people don't realise that anything that is not perishable and easy to use as a unit of account can be money as long as it is generally accept as such.
"Shell moneyis a medium ofexchangesimilar to coinmoneyand other forms ofcommodity money, and was once commonly used in many parts of the world.[1]Shell money usually consisted of whole or partialsea shells, often worked intobeadsor otherwise shaped. "
2nd, at the very least you need to WORK hard to get those bits of paper in order to pay your taxes. And it is from this fact that it can be said that those pieces of paper derive their value.