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Are Stop-Loss Orders Worth Their Commission Fees?

The beauty of the stop-loss order is that it costs nothing to implement. Your regular commission is charged only once the stop-loss price has been reached and the stock must be sold. You can think of it as a free insurance policy. Most importantly, a stop loss allows decision making to be free from any emotional influences. People tend to fall in love with stocks, believing that if they give a stock another chance, it will come around. This causes procrastination and delay, giving the stock yet another chance. In the meantime, the losses mount....
Source: http://www.investopedia.com/articles/stocks/09/use-stop-loss.asp