Read? Investing Made Simple by Uncle8888 (37) We may have to work harder to reduce our Asymmetrical Thinking over long run to produce better portfolio performance result. 1. Unable to control their emotions over P/L.  They are so worry that their paper profit will soon disappear when market shows some sign of turning against them so they are fast to take quick profit but when they are on paper losses; they are so slow and patient. Their patience can withstand decades of sitting on paper losses without worrying too much. Do we know that when we are very good and discipline at money management and position sizing (No deadly average down). We can only lose 100% of that position when we are deadly wrong; but when we are right and continue to be right for long time; we will make more than enough to recover that few deadly wrong ......