I think that I have to disagree with the statement above that teachers should be paid according to how much their students learn. In the following paragraphs I will give my reasons to support my opinion.

First of all, all people are different and they have different abilities to learn and understand the given subjects. Some students have to spend many hours studding a subject. At the same time, other students need half an hour to deeply understand the given lecture. Second of all, we all have different goals in attending schools. Some students want to gain more knowledge and experience that will help them in the future to succeed and make a great career. Others are forced to go to a school by their parents, so, basically, they do not care about their grades and studding.

I think that lowing or rewarding teachers depending on how much their students have learn is not fair.
However, I believe that evaluation of teachers by their students is make sense. Teachers who get high grades from their students deserve to be rewarded financially or otherwise. Otherwise, teachers who get low grades must be sanctioned. This will forced teachers to constantly improve their knowledge to get higher salary and simultaneously will improve the learning process. Students will have the opportunity to have the best teachers and get more interesting and comprehensive lectures.

To sum up, I think that teachers should be paid according to the quantity of hours given and the grades received from the students. From my everyday experience and observation the quality of the lectures given by the teacher often does not reflect how much a student learn or wants to learn.