Buying weakness and selling strength is the hallmark of the professional investor. Successful investors follow this mantra religiously, while their less successful brethren rarely ever buy weakness and sell strength in the stock market.  In fact, consistently struggling investors often do the opposite of the rules followed habitually by winning investors. The reason for this fact is simple.   It is because it is difficult to buy weak stocks.  It is much easier to buy stocks that are “hot” at the moment and moving higher. This is despite research and real life evidence making it very c...