David Graeber is an anthropologist. He apparently did a PhD thesis on "magic, slavery, and politics." What qualifies him to talk about the economy and the function of various jobs? I mean, hell, he's an anthropology professor declaring other jobs to be "bullshit." (But I won't go so far as to say "anthropology professor" is a bullshit job, because I'm self aware enough to realize that I probably just don't understand what economic function they perform.)