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How do you know when a woman has power? Is it enough to be influential and know how to get something done and who to speak to – or do you need authority, the muscle to follow through? And are there problems when it comes to how men and women perceive power? Jenni Murray talks to Anne McElvoy, public policy editor for the Economist, and Julia Hobsbawm, who runs media networking company Editorial Intelligence and recently won the Media Woman of the Year Award.