Tutor2u has this summary of voluntary action to be taken by a few large chains to list the calrie count of menu items
http://www.tutor2u.net/blog/index.php/economics/comments/calories-you-can-believe-in/
This BBC and Ch4 video clips covers the story
http://news.bbc.co.uk/1/hi/health/7985006.stm BBC video
http://link.brightcove.com/services/player/bcpid1184614595?bctid=18752147001 Ch4 video
a) What information failure is ther in eating a restaurant meal?
b) What external costs are there to obesity?
c) To what extent do you think a schemr such as this would reduce the market failure?
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