I would be interested in how the US mobility fared if the metric was not %, put purchasing parity. I imagine it is better to go from the bottom 10% to 20% in the US than bottom 10 to top 10 in many counties.
After all, an income of 15k (ppp) puts someone in the top 10% globally and 30k is the top 1%
After all, an income of 15k (ppp) puts someone in the top 10% globally and 30k is the top 1%