On May 15th, the Japanese yen, the third-largest component of the US Dollar Index with substantial daily trading volume and deep liquidity, does not typically exhibit "flash crash" behavior under normal circumstances. However, this past Thursday, amid a lack of significant news or data, the USD/JPY pair experienced two minute-scale plunges within a single trading day, a situation warranting close attention.
At 12:05 Beijing time, USD/JPY flash-crashed from a high of 157.92 to 157.50, a drop of 42 basis points in under one minute. Reviewing the economic calendar reveals no scheduled releases of Japanese economic data or key speeches at that time. Some analysts suggest this could be the result of direct intervention by the Bank of Japan (BoJ): taking advantage of thin market liquidity to execute large-scale dollar-for-yen conversions to bolster the yen's value.
A similar flash crash occurred again at 21:44 Beijing time. USD/JPY plummeted from a high of 158.14 to 157.29 within two minutes, an 85-basis-point drop, approximately double the morning's crash magnitude. Similarly, no major data or news from the US or Japan was released at this time, pointing to the possibility of another round of BoJ market operations.
This past Tuesday, USD/JPY also experienced a similar flash crash of about 91 basis points. Three suspected central bank interventions in one week may indicate that the current exchange rate has reached the upper limit of the BoJ's tolerance. On April 30th, USD/JPY experienced a daily-scale plunge exceeding 500 pips, with signs of BoJ intervention being exceptionally clear. Prior to that intervention, Japan's Vice Finance Minister had stated, "If you want to get out, this is your last chance."
The short-term objective of central bank exchange rate intervention is to guide market expectations. However, to alter the long-term trend of yen depreciation, the BoJ must gradually raise its benchmark interest rate to narrow the interest rate differential with the US. Japan's current benchmark rate is 0.75%, merely a fraction of the US Federal Reserve's rate of 3.75%. Such a wide interest rate gap makes it difficult to attract international capital to convert dollars into yen for long-term holding.
Regarding market trends, on the daily chart, despite strong suspected interventions by the BoJ, USD/JPY has maintained a steady short-term uptrend over the last five trading sessions. From a medium-term perspective, the 160.71 level for USD/JPY represents a strong resistance point. For bullish momentum to effectively break through this level, stronger positive catalysts are needed, particularly enhanced expectations for Fed rate hikes. Considering the BoJ's firm determination to curb yen depreciation, bullish capital may exhibit some caution. In the short term, close attention should be paid to any attempts to break the 160.71 level.
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