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There is a world shortage of coloured pencils. The reason: the immense popularity of adult colouring books, dominating the bestsellers list in the UK and America. It's just the latest seemingly childish fad among adults. Professor Benjamin Barber, author of 'Consumed: How Markets Corrupt Children, Infantilize Adults and Swallow Citizens Whole', explains why it is happening. (Photo: Faber-Castell coloured pencils by Ralph Orlowski/Getty Images)
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