My description wasn't "wealthy hoard money, empire make money." And I didn't say anything about anyone else's work. Honestly, I don't know what ax you have to grind here, but I really don't care. I assume you think you're arguing against someone who's trying to say it's the "natural and best way" and all that, but you're not, I'm literally just saying that these kinds of structures have occurred for millennia and seem to recur alongside broader imperial structures.