Steve Sailer has explained that Chetty's mobility numbers tend to be higher for mostly white areas, because the incomes of low-income whites and blacks tend to

Steve Sailer has explained that Chetty's mobility numbers tend to be higher for mostly white areas, because the incomes of low-income whites and blacks tend to revert to the white and black means. Given this pattern, it is not surprising that there is more mobility in Canada than the U.S., since a smaller fraction of Canadians are black.