25% of the world's billionaires . . .

Interesting testament against credentialism in education. From Facts about billionaires by Tyler Cowen (he is quoting another journalist).

Research shows that about a quarter of the world’s wealthiest entrepreneurs dropped out of university or high school before going on to join the financial elite, a greater proportion than those who achieved masters degrees.

On the other hand, about 5% of global billionaires have earned a PhD compared to 1.7% in the population at large, so PhDs are significantly overrepresented.