http://en.wikipedia.org/wiki/List_of_wealthiest_historical_f...
John D. Rockefeller: US$392 billion to US$663.4 billion in adjusted dollars for the late 2000s, and it is estimated that his personal fortune was equal to 1.53% of the total U.S. annual GDP in his day. PS: He was worth a billion dollars in
Cornelius Vanderbilt: US$178.4 billion adjusted for the late 2000s; Henry Ford: $188.1 billion; Andrew Carnegie US$75 billion to US$297.8 billion; , Astor has a real wealth estimated at some US$116 billion when adjusted for the late 2000s; John D. Rockefeller
This might be true. But Elon stands to be the first private citizen with a chance to reach the moon or Mars. The chance is (admittedly) slim, but the expected value of being commercially successful at reaching the moon or Mars is exponentially greater than Microsoft.
I'd be more surprised if he didn't reach the moon or Mars
Zubrin has argued that the colonization of Mars is analogous to North America, and will produce unprecendented wealth.
No, good point. That one doesn't count as pedantry on your part, but as a d'oh on my part!