[streptomycin]

I don't think it's clear that every problem can be solved by spending more money on it. In this case, if the root cause of the problem is outside the school, then the school may not be able to do much about it even given infinite funding.

[juve1996]

There's obviously a threshold - some amount of expenditure is needed. You need a certain amount of capital.

Obviously we're past that point at many places, and not enough in others. But if the underlying issue is poverty outside the classroom, I don't see how lack of money isn't the cause.