Earlier quoted context omitted.
> It hasn't solved Chicago Public Schools' problems. sure but it probably has solved many financial problems for Chicago teachers, which is a good enough reason to implement a tool like this.
No it's not. A teacher is supposed to teach. We want to pay them more because they keep saying that if we do they'll teach better. We don't owe them money simply because they exist.
Given a choice, would you prefer the teacher of your kid paid 30k or 60k? I'd prefer the second option even if it would be the same person teaching, because do you really want your kids to be raised by people in dire financial situation?
A prospect of smarter folks becoming teachers (or staying in the field if they're there already) is a nice bonus.