This number seems completely reasonable to me. 20 % of the working force is in the top quintile. It wouldn't surprise me if a fifth of them were in it for the m

This number seems completely reasonable to me. 20 % of the working force is in the top quintile. It wouldn't surprise me if a fifth of them were in it for the money, and if they found out they were underpaid despite being a top performer, they would quit. That works out to 4 %. I'm actually surprised the number isn't higher.