Generally speaking I completely agree with the conclusion of your response, but there is one point you make which is just flat out wrong:
"The origin of money is barter. In fact, money derives directly and unavoidably from barter."
Nowhere in recorded history has money ever derived from barter. It has always derived from credit or the need for mobilization of armies.
http://www.amazon.com/Debt-First-5-000-Years/dp/1933633867 No sorry. Money is the most liquid good in a barter economy, and arises naturally. And it does so, so quickly that there is no recorded example of a stable barter economy; at least not in the sense that some form of commodity didn't function as the monetary "change" in a barter transaction. There are plenty of examples of societies that evolved money well before any need to raise or mobilize an army, even before the invention of writing in order to record same.
Don't argue with me, argue with David Graeber and history.
Heheheh the fact that you cite a book which reviews the past 5,000 years betrays a misunderstanding of money, which is much older than that. We are not talking about round metal coins here. "Money" was deerskins and seashells long before coins existed, and long before any of the more advanced financial instruments examined by Graeber.
It's you who is arguing with history. It does not take a rocket scientist to realize that 50,000 years ago cavemen were exchanging one good for another (barter). You agree, right? During this barter, a smart caveman would realize that if he traded not just for things he personally wanted, but things
which others might want, then he could get more for his efforts. The first time a caveman realized this, and traded his meat for the fur which he knew another valued, money was discovered. As other cavemen realize that it's always easy to trade a fur to someone else, they begin using furs as a medium of exchange.
This is money. The world did not fundamentally change when these first cavemen started behaving this way, there was no point in history when mankind shifted from "barter" to "money." It's a progressive, natural process of marginally favoring certain goods over others which leads to one or several goods tending to become used as money.
Money is thus inseparable from barter. Stated differently, we're all still bartering every day, and the item we prefer to barter for is now called Federal Reserve Notes, at least here in the US.