I wonder how many have e.g. $1bn in cash, rather than in the form of owning shares they have no interest in selling in businesses that other people reckon they could squeeze that much out of? It isn’t zero, but the same reasoning that put a previous boss of mine on a rich list would (falsely!) turn me into a millionaire if I turned myself into a privately traded corporation.

The other question is: why $20 million? Looking at the rates on teleport.org, software developers in Nairobi look at the average Silicon Valley software engineer’s pay the same way the latter looks at someone who can earn $1-2 million per year, and I can’t think of any reason why the USA might care to limit its own salaries while other countries catch up.