The most important thing in currency speculation is to be disciplined and strictly abide by your inner trading principles. No matter how good the fundamentals are, a currency with a P/E ratio of 60 to 70 times is always expensive. In the past three years, many core asset stocks have plummeted from a P/E ratio of 60 to 70 times (or even more than 100 times) to a P/E ratio of 30 times, and their stock prices have been cut in half, although their competitive advantages are still very strong. However, the financial market has its own internal logic. Just because the media hype and professionals are optimistic about it will not necessarily support its high stock price. Expensive things will definitely fall in price, and things that fall in price excessively will definitely rise in price and rebound in the future. This is an eternal law of economics.