In his model, this would have only modest effects on global welfare; but how confident can we be of that? (nytimes.com)
We suspect prior studies that relied on variation in actual spending and found only modest effects of school spending may have been influenced by unresolved biases. (educationnext.org)
Now, I'd want to see third - party figures before being comfortable with claims like that, but even more modest effects could matter a lot. (educationnext.org)