I also have similar perspective, we have different levels and jobs in an organisation/company. The type job description determines the pay.
In the aspect of comparing different professions, e.g teachers and doctors. It is well known that teachers are underpaid but comparing them to doctors is a different thing. There are levels to teaching jobs, we also have lecturers, we have some lecturers that collect more salary than some doctors.
Most teaching job salaries are determined by the level you are, moreover the technicality of both profession differs.
No lecturer (I am in the University system) collects salary more than a doctor at the same level. The entry level of lecturing is about 107k net pay, their medical counterpart is more than 200k. That's how it is up to professorship and consultant ranks for lecturer and Doctor respectively.
Malaysia is paying primary school teachers more than university teachers and that's why you can find a PhD holder teaching in primary school. China is doing something close.
Technicalities are brought in to defend the unjust disparities.