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.
Many significant stock-price inefficiencies can occur when a company is spun off.
The mark of a wise person isn't never making mistakes - everyone makes plenty of them. Rather, it's the ability to quickly admit - and fix - them!
