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Governments are being told they must measure the happiness of their people. And Dr Richard Layard, who co-edits the World Happiness Report, says the evidence is now there to enable that to be done. He says tackling physical and mental health are key ways to improve happiness and are more effective than focussing on issues like poverty. Dr Layard works at the Centre for Economic Performance at the London School of Economics. (Picture: group of young people Credit: Thinkstock)