[juve1996]

Investment clearly works across all facets of our economy. It could work, in schools, too. But our society will never allow for what it really takes to adequately use the funding given to it.

It's not surprising students did better as they were younger. Poor districts expose children to bad outcomes earlier leading to poor performance in school, obviously during the teenage years.

[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.