Yen Intervention Unravels Amid Central Bank Discord

The US-Japan intervention to stabilize the yen is unraveling just over a week after it was implemented. The joint effort, which involved up to $97 billion in combined outlays by US and Japanese financial authorities, initially succeeded in lifting the value of the yen from 164 to the dollar to as high as 155 last week.

However, on Monday, the yen fell by 1 percent, wiping out half of its previous gains. Market strategists are attributing the intervention's diminishing effect to a lack of unified action among central banks, particularly the European Central Bank (ECB), which was not informed of the unusual joint effort.

According to Lee Ferridge, a market strategist at State Street, 'Without fresh interventions, it will continue to drift lower. It seems that the market is disappointed that we didn't see more intervention.'

The US Treasury's decision to use euros in its part of the intervention has been criticized by senior officials at the ECB, who view it as an unprecedented breach of longstanding conventions on cooperation between western monetary authorities.