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© The Financial Times Ltd 2012 FT and 'Financial Times' are trademarks of The Financial Times Ltd.
November 10, 2007 12:12 am
By Tim Harford
© The Financial Times Ltd 2012 FT and 'Financial Times' are trademarks of The Financial Times Ltd.
Printed from: http://www.ft.com/cms/s/cbc99a9a-8c11-11dc-af4d-0000779fd2ac,dwp_uuid=ac3ef27a-33fc-11da-adae-00000e2511c8,print=yes,Authorised=false.html
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