If you haven't had a chance to read Harari's Sapiens (and his other books, all great) I highly recommend it. He talks about the banking system and goes into detail on the concept of shared fiction. The idea that we live in multiple realities, the one where the lion eats you being the physical one, but also the one where all the stuff we have made up exists, which can also eat you.

The bit where he compares a priest waving his arms and poof god exists to a lawyer, waving his arms and poof a corporation exists is perhaps my favorite.