Richer nations are happier, yet economic growth doesn't increase happiness. This paradox is explained by the Hidden Wealth of Nations - the extent to which citizens get along with other independently drives both economic growth and well-being.

Much of this hidden wealth is expressed in everyday ways, such as our common values, the way we look after our children and elderly, or whether we trust and help strangers. It is a hidden dimension of inequality, and helps to explain why governments have found it so hard to reduce gaps in society. There are also deep cracks in this hidden wealth, in...