What are the possible reasons behind the sharp rise and fall of the yen?

< br > < b > USD/JPY rose to 160 and peaked at 160.20 < br > < span class = "section-news" > 1. "Fat finger" trading: Mizuho Bank said that the sharp drop in the yen in the Asian market on Monday may be due to the fat finger trading, indicating the extreme speculative behavior in the spot and options fields and the high sensitivity of investors to the risk of intervention. < br > < b > USD/JPY fell to 155, falling back about 570 points from the daily high < br > < span class = "section-news" > 1. Lack of liquidity during the holiday season: Exciting Stone Group said it has not heard of the Japanese authorities conducting a currency check, so it remains suspicious of official intervention. It may be that low liquidity during the holiday season has exacerbated the US/Japan slump. < br > < span class = "section-news" > 2. Profit-taking: UniCredit Bank said that the Japanese authorities have not commented on the possible intervention, and coupled with the lack of liquidity during the holiday season, the market may have only accelerated profit-taking after hitting the 160 mark. < br > < span class = "section-news" > 3. Official end-of-day intervention: TD Securities said that the rapid movement of the yen from 160 to 155 indicates that the Japanese authorities have intervened, and the timing of the intervention could not have been better in the face of low liquidity during the Japanese holiday season. < br > < span class = "section-news" > 4. Japanese banks sell dollars: Japanese bank traders say Japanese banks are selling dollars on a rally to clear customer flows; leveraged customers are following suit and selling dollars, in part driven by algorithmic platforms.