That chart isn’t right.
Doctors, on a weekly basis, bring home much more than that.
I know that most seasoned software developers bring home more than than on a weekly basis.
The reference to Doctoral degree is short for Ph.D. which is Doctor of Philosophy. This is not an MD, or Doctor of Medicine.
The PhD is achieved in almost any type of study, including: PhD Mathematics, PhD History, PhD Mechanical Engineering, PhD Piano, PhD Women’s and Gender Studies, etc.
So the $1,623 is an average for all PhD but does not include MD.