The Guardian:
What Americans can learn from British class guilt
28 March 2018
Numbers bear out this pessimism. As economist Raj Chetty explained in a 2016 lecture at the London School of Economics, the probability of a child born to parents in the bottom fifth of the incomes reaching the top fifth is 7.5% in America. In the UK, this number is 9%, according to research by economists Jo Blanden and Stephen Machin.