10 points
*
Musk has now surpassed Carnegie. You are right about Mansa Musa (for now), but the gap is closing. According to google today, Musk is at $334B, Carnegie peaked at a modest $309B, and Mansa Musa had about $400B, though there are quibbles about personal wealth vs. kingdom’s treasury. If you want to compare Musk and Musa, I think you could reasonably add the GDP of the US to Musk’s fortune, since he is one of the puppeteers behind Trump. All figures adjusted for inflation, by the way.