Who needs a profit/loss plan? Isn’t investing only about buying low and selling high? It would be nice to always buy at the bottom and sell at the top, but it is nearly impossible to do so consistently. Furthermore, investors are only human: emotions sway our judgment and it is in our nature to hate losing. Taking a loss on a stock, therefore, is not only detrimental to our pocketbooks, but it also hurts our egos. Time...