I did not know David Graeber. We knew of each other and had exchanged once or twice, but I make no more claim that that.
But I was a massive fan of his work, and most especially his work on debt. His book on 'Debt: The First 5,000 Years' has its own Wikipedia page.
David understood money:
David died yesterday. He was not yet 60. He's a real loss to progressive thinking.
As Steve Keen said yesterday, if there is life after death, and David is in heaven know, he'll be observing it acutely having been to hell on the way in, just for the sake of comparison.