it's a good book, but the earlier chapters regarding tribal economics and the valued currency being tribal women themselves is questionable from a truth standpoint.
Tribes traded people for goods and services, sometimes temporarily. It was mostly a sex and politics thing, but the book views it as a form of currency bartering and trade; I think there is more nuance there.
One of the most interesting things I've heard about money is what Giordano Bruno (1548 – 1600) supposedly said: "Whatever has the greatest value and the least cost of storage becomes money."