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The global population is still growing, with the UN predicting that it will peak at 10.3bn in the 2080s. But in many advanced economies, it's falling, with both rates below the 2.1 needed to keep a population stable. But why? And how will it affect the global economy? Subscribe here: http://bit.ly/1rbfUog For more news, analysis and features visit: www.bbc.com/news #BBCNews