It's odd that the article just drops this figure and then moves on:

> In 2011, Forbes reported that 63 of the 400 richest people in the world never got further than high school.

That's a really interesting number! Of the richest of the rich, all but 16% have a college degree. Among the general population of adults, 40% have a college degree in the US, and under 7% worldwide. If the richest of the rich followed the same proportion, we'd expect 240 of those 400 to have stopped at high school for the US number, or 372 for the worldwide number.

Clearly there is an extremely strong link between extreme wealth and higher education. We can argue causality and necessity, but it's weird to blow right past such a number.