Yeah, there would be a run on honors and AP courses, or at more affluent or parents/community-supported schools. The toughest job is a new teacher's classes, or any teacher in an environment without an emphasis on learning (notice I didn't put "testing" or "results" ). If you get a kid to love learning, or an 8th grader to improve from a 4th grade level to a 6th grade level, or make a 90-point testing jump (but the overall scores's not yet at "proficient" ), that's pretty darn effective. If merit just means "reach a standard level," I'm not in favor of that.