I think that the point the author was trying to make is that Mark Zuckerberg has a selection bias due to the fact that the people that he is around are generall

I think that the point the author was trying to make is that Mark Zuckerberg has a selection bias due to the fact that the people that he is around are generally similar (highly educated, college grads, etc.). Therefore, his view on the world is skewed towards that bias. I think that this is true, but not just of him. If you were to talk to some of the low income families, they would probably have the reverse bias. The disparity between Zuckerbergs income and the average would tend to support the author, but that depends on how well Zuckerberg realizes and compensates for the bias. I'll leave this to be answered in the future.