Krueger seems to think that the namesake of his chart achieved it when there was a balance of a winnowing gap of equality and more easily enabled social mobility.

FORBES: Paul Krugman Gets Economics Wrong, The Great Gatsby Too

Mr Clegg argued that life chances could not be evened out simply by reducing inequality, pointing to Australia and Canada as examples of countries with a similar gap between the rich and the poor as the UK but much better levels of social mobility.

BBC: Birth weight among social mobility checks - Nick Clegg