The Spirit Level: Why More Equal Societies Almost Always Do Better was published in 2009. Written by Kate Pickett and Richard Wilkinson, the book highlights the "pernicious effects that inequality has on societies: eroding trust, increasing anxiety and illness, (and) encouraging excessive consumption". It shows that for each of eleven different health and social problems: physical health, mental health, drug abuse, education, imprisonment, obesity, social mobility, trust and community life, violence, teenage pregnancies, and child well-being, outcomes are significantly worse in more unequal rich countries.
As of September 2012, the book had sold more than 150,000 copies in English. It is available in 23 foreign editions.
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