Why is the incidence of mental illness in the UK twice that in Germany? Why are Americans three times more likely than the Dutch to develop gambling problems? Why is child well-being so much worse in New Zealand than Japan? As this groundbreaking study demonstrates, the answer to all these hinges on inequality.

In The Spirit Level Richard Wilkinson and Kate Pickett put inequality at the centre of public debate
by showing conclusively that less-equal societies fare worse than more equal ones across everything
from education to life expectancy. The Inner Level now explains how inequality...