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From Libor rate-rigging to the sub-prime mortgage crisis, many say that problems in banking culture lie behind these scandals. But can it be changed? In this excerpt from The Inquiry, Dutch regulator Wijnand Nuijts explains how his team uses psychologists to try to improve bankers' behaviour. (Photo: The Goldman Sachs building is seen in lower Manhattan on April 15, 2016 in New York City. Credit: Getty Images)