Interesting thought:
"...Rule One of the professional trader is: When a stock doesn’t do what you expect it to do, sell it. No hesitating, no questions or doubts raised no conjectures of the way it should have turned out, or might still turn out, no dreams of how it will do what it was supposed to do‚ tomorrow. The pro never says, “I’ll watch it one more day”. He doesn’t phone an analyst who’s been following the company and ask, “What’s happening? Is there any news?” All too often, the delay in searching for the‚ “why?” is costly. The desire to be perfect is one of the prime bugaboos of the stock market, but it’s a compulsion that belongs on the psychiatrist’s couch, not on the exchange floor."
http://www.tradersnarrative.com/
Lady