Beware False Prophets is Policy Exchange's critique of The Spirit Level, a 
book published last year by Richard Wilkinson and Kate Pickett, which 
argued that income inequality harms almost everybody in society, no matter 
how prosperous they are.

http://www.policyexchange.org.uk/

In Beware False Prophets Wilkinson and Pickett's empirical claims are 
critically re-examined using (a) their own data on 23 countries, (b) more 
up-to-date statistics on a larger sample of 44 countries, and (c) data on 
the US states. Very few of their empirical claims survive intact.

Wilkinson and Pickett response: 
http://www.equalitytrust.org.uk/saunders-response

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