Apple Computers is a famous example: it was founded by (mostly Republican) computer engineers who broke from IBM in Silicon Valley in the 1980s, forming little democratic circles of twenty to forty people with their laptops in each other's garages.
Mark Gimein of Businessweek calls this the strangest history of Apple ever and tracks down what Graeber claims is the source.
I also ran into a few dangling references in the footnotes (i.e., to things not listed in the bibliography.) Not the most carefully-written book, but it's interesting to hear about economics from an anthropological viewpoint. The author does himself a great disservice, though, by conflating things he knows well (non-market-based societies and how they actually work) with things he's just hand-waving about or garbling somebody else's message.