Harvard taught me to admit 'I don't know': Ashwin Damera

'Asked how many McDonald's outlets exist, most people guess a number instead of a safe wide range,' Ashwin Damera, an entrepreneur, said, recalling a Harvard decision-making exercise. "Express your ignorance through a range," he explained, adding that overconfident people make poor leaders, while admitting ignorance pushes leaders to seek more information and diverse experts.