Amusingly enough, what the GP stated was true in 1910, but now the US is far more like pre-WW1 Europe in terms of distribution of wealth (c.f. Piketty's capital in the 21st century).
Social mobility index doesn’t really look at how easy it is to become very rich (I.e. get into the 1%). This is also explained in the methodology section of the article you linked.
disgruntledphd2|10 months ago
hansworst|10 months ago
mamonster|10 months ago