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But business leader Sir Martin Sorrell says he remains upbeat about China's prospects. Also in the programme, we have reports from the region between Colombia and Venezuela, where people are risking their lives to smuggle goods across the border. Terry Pratchett's final book goes on sale tonight. What does its film-premiere-style launch say about the business of hardback books? Plus we take a look at the money behind watching other people play computer games. (Picture: Stock Market Traders. Credit: Getty Images.)