1) This would severely impair the earning potential of SpEd teachers; many SpEd students either don't work after high school, or get jobs doing dishes (or similar work). My high school (I went to a school for the Deaf) had 100% of its students on IEPs (Deaf persons are generally underemployed by a pretty decent margin), and about 1/5 of the students there had multiple disabilities.<p>2) This would encourage teachers to go after those students whose future earning potentials seem highest.<p>I'm a good teacher, but there's only so much I can do with 180 hours over the course of the year, particularly when that 180 hours is split up among 25 students. This isn't excuse making (there have been a few students for whom I've made a substantial difference), but rather an illustration of the pragmatic difficulty of providing 1-on-1 attention to every student, or even to most students.<p>3) We already do this, at least somewhat. Here in the US, most public schools are paid for by way of property taxes. In more affluent areas (read: where people earn more money, or at least are able to spend more money), the schools tend to be better, as they have nicer facilities, more resources, and better-paid teachers. More importantly, their students are accustomed to a higher SES, and so see that as the default position (not many people want to downgrade). The biggest predictor of a child's future earnings is how much his or her parents make.