Investors beware: your egos are your worst enemy

VIDEO: Investors often think the more time and money they plug into a business idea, the better the outcome. But a step too far and a failed enterprise is a costly thing. Could a bit of pessimism help mediate this?

World Finance spoke with Lee Freeman-Shor, author of The Art of Execution: How the world?s best investors get it wrong and still make money, on what makes a successful investor.