You are right. I'm a big fan of Graeber, but I wrote the earliest version of this as a parable for my children prompted by the Rousseau quote, before I'd read 'The Dawn Of Everything'. Although my little story is set in the pre-Roman early commons era of England, rather than the Sumerian example given in '5000 years of debt', and my focus was more on hierarchy rather than debt. But it seems there is a need for a more historical article to address the origin of these concepts as well, although as I recall Graeber's research also supports that exclusive ownership of previous common resources is often used to enable and justify hierarchy.