How do we know who the richest people in the US are? Forbes' list is based largely on first-order research of federal filings, like stock ownership, compensation, and extrapolation from data that is made public. But with so many ways of channeling wealth, it seems likely the very wealthiest could easily remain anonymous. I don't recall who said this, but the president of a hedge fund was being interviewed by Forbes and told them, paraphrased, "You have no idea how much money I have, and you never will." I could be wrong about how the Forbes list is computed, but it seems to be more guesswork than rooted in reality, since the Paradise and Pandora papers uncovered more wealth than has been reported. (Again, I'm not 100% certain I'm mixing up internet disinfo.)