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Do Manchester United and other leading clubs like Real Madrid and Barcelona benefit from biased refereeing decisions when they play in front of their home crowd? It's a widely-held view, but Tim Harford challenges it with a look at the penalty statistics. Do Manchester United and other leading clubs like Real Madrid and Barcelona benefit from biased refereeing decisions when they play in front of their home crowd? It’s a widely-held view, but Tim Harford challenges it with a look at the penalty statistics. Plus, he meets Hans Rosling of Gapminder at the Skoll World Forum: if you want to understand the world you’re living in, and how it will be different to the world your children and grandchildren will live in, listen to this interview. (Image: Wayne Rooney of Manchester United scores his team's second goal, from a penalty kick, during the match between Manchester United and West Bromwich Albion. Credit: ALLSPORT/Getty Images)