Another example of someone in power saying "Hey, see this problem we created? Well, we also have the solution..."
Ancient taxes were assessed in kind, most commonly in grain or labor. The reason was that the government wanted the grain or labor. The main benefit of taxing in metal is that grain is perishable and voluminous, not that it creates demand for more metal.
Consider a stylized section of Chinese history:
State-issued currency: copper coins (low value, accepted most places); paper notes (high value in the capital, hard to spend elsewhere)
Means of exchange: raw silver valued by weight
Form of taxation: silver
1. Currency invented where there were just raw materials before. ("Conceptual invention")
2. Currency invented to replace or exist alongside other already-known currency.
In case 1, I believe the currency is generally an object that was already valuable, and therefore doesn't need support. Coins were usually able to trade a little above their value as measured in raw material because of the nominal standardization they provided.
Case 2 is not at all rare, and there are even cases of states deciding to make coins from a worthless material (iron) for ideological reasons. Everyone can have iron.
This seems like an ideal case for propping up the (otherwise too low to bother with) value of the ideological coins, but I'm not really up on the history of this kind of thing. I know the iron-coin states were often economic failures (e.g. Sparta). I know there were a lot of difficulties with paper money in China, but I don't know the details.
The wikipedia article briefly mentions this: https://en.wikipedia.org/wiki/Debt:_The_First_5000_Years
"The author postulates the growth of a "military–coinage–slave complex" around this time. These were enforced by mercenary armies that looted cities and cut human beings from their social context to work as slaves in Greece, Rome, and elsewhere. The extreme violence of the period marked by the rise of great empires in China, India, and the Mediterranean was, in this way, connected with the advent of large-scale slavery and the use of coins to pay soldiers. This was combined with obligations to pay taxes in currency: The obligation to pay taxes with money required people to engage in monetary transactions, often with very disadvantageous terms of trade. This typically increased debt and slavery."
It occurred mostly in subjugated nations as a way to bring in the new money (from the perspective of the conquered, who saw no value in this foreign coin). It accelerated adoption in populations who had no familiarity with the system, and indeed may have been operating on non-monetary systems still (the book credits Alexander as wiping away many of the last vestiges of such economies).
Looking at the above passage, it has some resemblance to company scrip.
I'm trying to get a sense of where to put this on a continuum between "I could imagine things happening this way" and "here are contemporary records in which the king specifically states that the new tax is needed in order to get people to accept the new coins".
Postulation isn't really what I'm usually looking for in a historical work.
The book's very well-constructed that way, actually—make assertions that the thinking reader will have objections to or questions about, proceed to directly call out and address same in following paragraphs—but apparently some people's eyes go so red on reading something they don't immediately agree with that they totally miss the explanation and defense that follows. In short, many of them accuse the book of specific sins it did not commit. Others don't provide enough specific criticism to be analyzable, usually accusing it of the same sorts of problems but without enough details to tell whether the reviewer's just a bad reader like a lot of the other people dumping on it.
Possibly there are good negative reviews out there, but a good percentage of them seem to be folks who are, bluntly, not literate enough to read the book—though it's far from a challenging read.
All history is viewed through the eyes of the author's politics. I accept that, and set my personal politics aside and considered his history. One of the major positives of this book is its ambitious scope. The narrative spans millenia of history and I respect that ambition.
I don't agree with everything Graeber says but he proposes new ideas (to me at least). Those new ideas are fun to consider and think about.