When reviewing one's portfolio, it is important to be aware of common mental mistakes that may lead to bad decisions. The most powerful is commitment bias, which, as manifested in investing, is the tendency to fall in love with one's stocks.

To a large extent, equity investors put their hard-earned capital into the hands of management and count on it being employed skilfully and honestly. When that doesn't happen, losses typically follow.

Assessing management quality is clearly one of the most important aspects of an investment decision.

Whitney Tilson Quotes