The Japanese Yen surged 0.8%: suspicions of intervention rise again, 157 is a critical battleground.

Notice that on Monday, the Japanese yen surged during the Asian trading session as traders remained highly cautious about the possibility of the Japanese authorities intervening in the market again. Last week, the Japanese authorities may have intervened to stem the yen's decline. During the thin holiday trading session, the yen rose by 0.8% against the US dollar to 155.72 yen per dollar, before giving back most of the gains. This sharp fluctuation occurred after Japan may have used around 5.4 trillion yen (345 billion US dollars) to support the yen, sending a warning signal to traders after the exchange rate fell below 160 yen per dollar. David Forrester, Senior Strategist at Oriental Bank, stated that it is not clear if these fluctuations reflect another round of intervention, as "the low liquidity levels due to the Golden Week holiday could amplify market volatility. It is worth noting the level of the dollar against the yen at 157, as the exchange rate has been twice blocked above this level after reported intervention actions." On Monday, Japanese Finance Minister Kaoru Okuizumi declined to comment on potential foreign exchange interventions. During the Asia Development Bank (ADB) annual meeting in Uzbekistan, she stated that speculative trading is occurring in the market. Even though officials are avoiding questions about recent market trends, attention is shifting to how much ability Japan has to address the weakness of the yen. According to analysts at Goldman Sachs, Japan has enough "firepower" to intervene 30 times at the scale of last week, but officials are expected to protect their reserves and intervene at more opportune times. The Wall Street bank added that intervention during periods of relatively mild volatility indicates that policymakers consider the 160 level as a "defense red line."