> In Washington State, teacher salaries were raised substantially,
Can you cite where you saw this data, what time period it refers to, what "substantially" actually means, and include a comparison against inflation, please?
> ... plus a substantial increment for every student in their class that meets grade level expectations at the end of the school year.
I think basing teacher pay on merit is a great idea in theory but I have some problems with it. Most of all, student performance is influenced to a greater degree by things outside the teacher's control like the student's socioeconomic status, their attendance (or lack thereof), their parent's education, and even the air quality in their school.
I also don't know how "teacher" raises based on "meeting grade level expectations" would work past elementary school when students are cycling through seven teachers a day? Just because one child excels at math do you give the math teacher a greater raise?
Finally, what if a student does NOT meet grade level expectations, but shows the greatest improvement year-over-year against any other student. Do you fail to recognize the achievement of the teacher who improved this student's outcome because the student does not meet grade-level expectations?
These are just some of the problems which make this a much thornier issue and worth greater consideration. It sounds good when you say teacher pay should be based on merit, but it oversimplifies things quite a bit.