@2manycollegequestions4me that would be expected due to selection bias as well as connections-related majors (finance, law, business).
If you want to work in a relationship based field you absolutely need to build those connections. But it is not necessarily true in medicine, engineering, or technical fields to the same degree. With respect to selection bias, you would expect top performers to go to too schools, so you would expect higher average earnings.
It doesn’t mean a top performer from a good public cannot achieve the same thing later, but that most top performers go to top schools in the first place.
Does that make sense? You need to look at individual paths to get a sense of what is happening here.