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Elon was uniquely rich is US history but his wealthy fluctuates wildly: https://finance.yahoo.com/news/rockefeller-rich-elon-musks-wealth-180019563.html https:

• ksec 2y ago
  I don't like this market cap against GDP measurement. The multiples in Market Cap in those era would be significantly lower. If we look at P/E of S&P 500 [1], what used to be peak PE of 20 a century ago are now considered normal. So adjusting for all that Rockefeller would still be richer than Elon. [1] https://www.multpl.com/s-p-500-pe-ratio https://www.multpl.com/s-p-500-pe-ratio