Also Debt: The First 5000 Years - Greaber, supper interesting, but I rarely see it discussed in Bitcoin circles.

The core thesis, to my understanding, is that credit was the original form of money, but different civilisations also used different things as money depending on the asset being exchanged.

The most striking insight for me from the book is that religion and morality, what is good and what is bad, is tightly linked to the debtor/debtee interactions.