[lukeasrodgers]

The author states "Nor is [poor education performance in America] due to high levels of inequality: the proportion of American children coming from under-privileged backgrounds is about par for the OECD."

I'd be interested to see a citation for this claim; I think it's either misleading, or things have changed a lot over the last 5-8 years (which I doubt). What I recall from my time working in education research, looking at the international tests including PISA, is that average scores from the USA are brought down by the fact that the bottom-performing kids do so much worse than elsewhere, which if you look at the way public school funding works in America, makes a lot of sense (i.e. wealthy district = higher taxes = more funding for public education).

The problem isn't that America has more low-SES students than other places, it's that we (speaking as someone currently living in America) do a worse job educating them. I'm not saying that the problem is only inequality, but it is definitely part of the picture.