I wonder if there are some holes in their methodology with regards to how people are paid in the US vs Europe. Like are they factoring in government benefits of teachers and staff that aren’t part of work like they are in the US. Salary and Benefits is a huge part of the cost, as well as land and construction costs.
My understanding is salaries are higher in the US in part because of the lack of universal healthcare, and other things that end up coming out of people’s pockets when compared to Europe. I did a little digging on the site, and it does look like salary and benefits are up to 80% of the cost.