The correct answer to this open question is the following.
Given the risk that low-performing teachers may do a poor job of preparing their students for eventual career success, do you think it is ethical to pay teachers without taking into account their performance?
No, of course, it is not ethical to pay for a job that is not done or performed with poor quality.
The role of the teacher is of the utmost importance. He/she is modeling, influencing, and teaching the next generation of citizens that are going to run a country, a corporation, and families.
So, schools and educational institutions must have a high standard of training their teachers and then, demand quality results that are supposed to be measured to prove if the work of teachers is above what is expected of them.