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Sep 28: The investment 'black box' lives on

Sep 27 2009 Part 1: Leading pioneer of quantitative investment Donald Putnam, managing director of Grail Partners, defends the use of the computer 'black box' by asset managers. But in this revealing interview with investment editor John Authers, he concedes that the credit crunch has provoked a far more nuanced approach to mass stampedes and "weather conditions" in markets. (11m 2sec)

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