[YPCrumble]

Presumably it’s this study: https://www.researchgate.net/profile/Elissa_Cameron/publicat...

It cited 60% male to female billionaire ratio on n of 350.

But, the methodology was to use google and Wikipedia for research so a more honest claim might be “male offspring of billionaires show up in search results more often.”

I suppose that factoid wouldn’t have been paid for by the publisher though.

[YPCrumble]

Thinking more about my own comment, perhaps researchers expecting to find more male offspring while googling find male offspring more often!

[ZeroGravitas]

Worth bearing in mind that the birth ratio is generally tilted towards boys, about 52.5%