For example you could pay for the teachers salary and the infrastructure like the physical materials a classroom or schoo! is made of in a public high school in a black neighborhood but a lot of black students simply will not show up
It would cost more money on average per black person to persuade them to show up than the cost of the infrastructure and the teachers divided by the number of black people that are supposed to show up
That is if you ignore the cost of repairs when they do show up
You could calculate this and try to prove me wrong but I suspect if for example there was an ad campaign to increase school attendance or some other means to persuade
And you took the cost of the campaign divided by the number of additional black students that showed up consistently as a result of the campaign
I suspect that would be greater than the salary of the teacher divided by the number of students of all races they are supposed to teach if the students do not cut class
Prove me wrong