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Is the education spending comparing the actual dollar amount or is it adjusted for PPP? Or is it by percent of federal/state/municipal spending?

It’s PPP adjusted: https://www.oecd.org/edu/EAG2014-Indicator%20B1%20(eng).pdf. See page 207. I was incorrect: it’s Norway, Luxembourg, and Switzerland ahead of the US.

Gotcha. Thanks for the link