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This week's programme rolls out the stars - some of the world's economic heavyweights. The US Trade representative Ron Kirk tells us about the growth in protectionism and his hopes for the Doha round of trade talks. Lesley Curwen gets an insight into Germany's economy from that country's Finance Minister, Peer Steinbrück. London's former mayor, the Enron whistle-blower and a hedge fund manager all talk about greed. And getting round the blocks on Internet sites in places like Iran, China and Burma. We talk to a man who's set up a company to beat the censors - can he find a way round the walls?