[Arbitrage Traders Rebuild Yen Short Positions Amid Japan's 'Market Rescue'; USD/JPY May Retest 162] BlockBeats News, August 14: The effectiveness of Japan's intervention in the foreign exchange market to boost the yen is being challenged. Market data shows that arbitrage traders are using each round of yen rebounds as an opportunity to rebuild short positions, creating a cycle of 'intervention pushing up the yen—traders shorting at highs.' Previously, joint intervention by the U.S. and Japan briefly strengthened the yen, but less than two weeks later, USD/JPY is once again approaching 160. For arbitrage traders, official intervention has instead provided better selling prices for the yen. This trading logic is primarily based on interest rate differentials: investors borrow low-interest yen and allocate it to high-yield assets. As long as the yen does not appreciate significantly, the interest rate differential can offset part of the exchange rate risk. As of August 4, hedge fund yen short positions had been reduced by about half, but some institutions are rebuilding arbitrage trades using the yen as a funding currency. Market data shows that USD/JPY has rebounded from around 157 to 159.43. Some traders believe that if the U.S. dollar and U.S. yields do not show significant declines, arbitrage trading may push USD/JPY to retest 162. Reports previously indicated that Japanese authorities may have spent hundreds of billions of dollars at the end of July to support the yen, with single-day intervention amounts possibly reaching approximately $53 billion, setting a historical record. However, large-scale intervention has still failed to prevent the yen from nearing 160 again, indicating that market focus on U.S.-Japan interest rate differentials and Japan's fiscal pressures remains dominant. Currently, the market is closely watching the next policy moves by the Bank of Japan. Traders are betting that the Bank of Japan may raise interest rates by 25 basis points in September or October, but analysts believe that as long as Japanese interest rates remain significantly lower than those of major economies like the U.S., arbitrage trading using the yen as a funding currency is likely to persist. [Original Link]