Share Livermore's buying method: First buy 20% as the base position. If you buy the wrong position, stop loss immediately when it drops 10%, and the loss amount is 2% of the total position. If you buy the right position, add 20% for every 10% increase, and add 40% directly for the last time. As long as it does not fall below 10%, hold it. Once it falls below 10%, sell all positions immediately!