Edit: Example. In 2010 he gave $3.5 million to charter schools in Newark, NJ. This has contributed to overall increase in success rates in such schools, which has boosted the entire city's graduation rates. They've increased significantly each year since 2013, which is about the first year you'd expect to see the results of such a grant on 4-year programs like HS.
I'm glad we have some billionaires trying alternative, independent paths to success!
The problem is that they found what everybody knows but doesn't want to admit. The current public school system is about optimal for the amount of resource being spent. There is no mythical "pile of waste" that you can magically draw from.
They found that focused resource does help outcomes, but in far less proportion than the increase. If you want 5% improvement in achievement, you need closer to 25% increase in resource--and it needs to be sustained over years. More teachers that are better qualified is a good idea, but that is also the most expensive choice. And, your most effective option is to spend almost all your resource on the lowest achievers. All of these are highly politically unpalatable in the US.
Belated reply, catching up on my reading.
This is a very interesting point.
I live in a largish school district. I've long believed, but cannot prove, that it's just too big. eg Scale matters. Everyone I've ever met who has ties to the district agrees with me.
I know the CFO. He crunched some numbers, comparing cost per student and outcomes. Although he wouldn't share the data with me (political suicide), he related that the it's a bathtub distribution.
So, I believe, but cannot prove, there's an optimal range for most organizations, and education reformers would get a lot of mileage out of correct sizing their districts.
https://www.forbes.com/sites/denizcam/2017/11/13/microsoft-b...
Polio have been eradicated in developed nations by the 1980s.