Ultimately, this is correlation, as there's no consideration (for example) for socio-economic status. More accurately would be: A degree and it's type out perf

Ultimately, this is correlation, as there's no consideration (for example) for socio-economic status. More accurately would be: A degree and it's type out perform other degress as well as no degree at all. That is, and the data / examples in the article support this. Furthermore, average is always a deceptive metric. In this case, it hides the degrees that don't out perform no degree. Of course education is important. These are simple questions about the integrity of this report / analysis.