I read it some time ago (~2011) and don't remember the details. At the time, I knew nothing of money and took most of the book at face value.
However, when I later began studying Austrian economics, it became quite clear that Graeber's assumptions were based on circular reasoning, and that Graeber's writings on economics are through a left-leaning lens. That isn't to cast doubt on his work on Anthropology, which is fascinating to read, but I have doubts that he truly understood Menger's argument to begin with (or perhaps willingly chose to filter it to fit into his world-view.)
However, when I later began studying Austrian economics, it became quite clear that Graeber's assumptions were based on circular reasoning, and that Graeber's writings on economics are through a left-leaning lens. That isn't to cast doubt on his work on Anthropology, which is fascinating to read, but I have doubts that he truly understood Menger's argument to begin with (or perhaps willingly chose to filter it to fit into his world-view.)