The foreign exchange market has been calm in the past few years. The large shock mode of the the US Dollar Index has caused most currencies to trade in a range mode. However, there are also outliers among them. The yen continues to fall and set a new historical low, but it is still not intervened by the central bank. What is the reason behind allowing the yen to fall?From the trend of the yen in CME group, it can be seen that the historic low has been moving down in the past few months, which also includes the macro environment where the Bank of Japan has begun to tighten. Looking forward, the Bank of Japan also briefly intervened in the foreign exchange market in 2022-2023, but the intensity was relatively limited, and the yen also rebounded slightly before sinking again.Obviously, from t