I would assume that most of the early Mesopotamian societies were the same. IOUs were the first form of currency, used for trade and bookkeeping. But after a wh

I would assume that most of the early Mesopotamian societies were the same. IOUs were the first form of currency, used for trade and bookkeeping. But after a while you'd see consolidation of wealth in the hands of a few, which would have been antithetical to the everything they knew at the time (group > individual).