If teacher pay were based on performance and merit; they wouldn’t be paid minimum wage.
Do you mean they would then be paid BELOW minimum wage?
Not sure where you live, but teachers in my neck of the woods hardly make "minimum wage." (Bucks County, Pennsylvania)
The starting salary of a public school teacher right out of college is about $43,000 (plus generous benefits) ...
Within two years, they make about $55,000 a year plus ADDITIONAL benefits.... such as 100% paid top line Blue Cross, plus a district-state matched pension.
And within seven (7) years they 'max' out, so to speak, at between $85,000 and $100,000 depending on which school districk they work at.
If they coach a sport, or do any extra-cirricular activity they receive an additional $5,000-$7,000 each year.
Add in the fully paid sabaticals and the fact they only work 9 months a year (actually only 185 working days)... they hardly make minimum wage.