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Social mobility in the USA is actually much lower than in other developed countries.

Social mobility is basically invariant across societies, with a heritability of about 0.7 according to Gregory Clark’s research (A Farewell to Alms, The Son Also Rises, the upcoming For Whom the Bell Curve Tolls). The difference is explained by the number of generations covered.

It's not the best in the USA but I understand it's not terrible. https://www.oecd.org/centrodemexico/medios/44582910.pdf

It's also incredibly complex so perhaps it was a silly thing for me to comment on as I don't think it's that easy to define or measure.

upward mobility doesn't scale well. USA is doing epic for the scale on the upward mobility. If you were born here or get to become a citizen you've won a lottery compared to the bottom 50% of the world. To claim much worse and to be a US citizen is to say you've 'earned winning the lottery' .. Not to build up the US or put down any other country just the way it is imo

They do measure it though, and the best measurements show that the USA does not compare favourably to other developed nations at all.

I think the line commentators tend to use is “the American Dream is alive and well, in Denmark”

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