Play Your Strengths The Problem with Value Managers Acting Alone

Varying Outlooks may be a Recipe for Success

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One reason our results have been relatively strong is because our mistakes have been in smaller positions and our successes in larger ones. I attribute a lot of that to our partnership: I tend to be a glass half-full person, while Ed [Co-manager Edward Studzinski] behaves more as if the glass is broken and empty. He helps restrain my more aggressive instincts and his natural skepticism has been incredibly valuable.
Source: http://www.valueinvestorinsight.com/