Read it some years ago, found it interesting as a counter argument to the usual first they bartered with shells myth/story. Seems logical that in tribal societies there would be debts first between members (cows, bride price, whatever) that would be on a handshake basis or adjudicated with the chief. Later moved to a ledger at the temple and in agrarian society a bushel of wheat, etc. could be accounting unit and off to the races as trading networks spread one searched for more durable, universal form of money. #debtprecededmoney