Recently, the Japanese yen has been skyrocketing in value, with the USD/JPY almost falling below 152. I looked at the data, and it has been declining for four consecutive days, clearly indicating a shift in market sentiment. The main reasons are the Bank of Japan's hints at possible interest rate hikes, combined with easing fiscal concerns. These two factors together have driven the yen to keep appreciating. Speaking of the yen's appreciation, it makes me think about how much 10,000 yen can be exchanged for in Chinese yuan; this exchange rate change also affects us. Hedge funds' recent actions are quite interesting—they are increasing their bets on the yen strengthening. From the options market, the trading volume of put options is 50% higher than that of call options, indicating that the market expects the yen to continue rising. Most importantly, BCA Research issued a warning that the yen's appreciation could trigger a large-scale unwind of arbitrage trades. What are these arbitrage trades? They involve borrowing yen to buy U.S. stocks or other high-yield assets to earn interest rate differentials. Once the yen starts appreciating, these trades must be reversed—selling assets to buy yen and repay debts. With such a large volume, if a wave of unwinding occurs, the yen's rise could be very sharp, potentially even putting pressure on tech stocks. From a technical perspective, the USD/JPY has already broken below the 100-day moving average. If it falls below the previous low near 152, the next support level is around the 150 mark of the 200-day moving average. This wave of yen appreciation is definitely worth paying attention to.