Why can many people manage their positions well when they have a small position, but when the position gets larger, they easily incur losses? Investing is a discipline. In my view, trading is like a formula problem; there is a sequence from 1 to 10. If you make a mistake with one number in between, you lose everything. Everyone understands the principle that one misstep leads to more errors. Once position management encounters problems, the next thing to be affected is the mindset. When the mindset goes wrong, most people will make serious mistakes, getting stuck in trades, frequently averaging down, which ultimately leads to larger positions. When it's really time to average down, they are at a loss and too scared to act. Those who can manage their positions well are the most suitable for trading.