Japan’s Reserve Drop Exposes Yen Pressure

Japan’s foreign reserves suffered their largest monthly decline on record in August as Tokyo intensified efforts to stabilise the yen, exposing the growing cost of defending the currency against persistent market pressure. The intervention offers temporary relief, but also highlights the limits of relying on reserves when underlying monetary forces remain unfavourable.

Official reserves fell by $79.6 billion to about $1.21 trillion at the end of August, according to the Ministry of Finance. The decline was driven largely by reduced holdings of foreign securities, including US Treasuries, as authorities sold dollars and bought yen during their biggest monthly intervention to date.

The action helped pull the yen away from four-decade lows near 164 against the dollar, although the currency later surrendered part of those gains. Tokyo also coordinated part of the operation with Washington, the first joint intervention by Japan and the US since 2011, reflecting concern over the wider financial impact of disorderly currency moves.

For Japan’s economy, the stakes extend beyond exchange rates. A persistently weak yen raises the cost of imported energy, food and industrial materials, keeping pressure on household budgets and business margins. Exporters benefit from stronger overseas earnings, but that advantage becomes less convincing when domestic purchasing power is being eroded.

Japan still holds one of the world’s largest reserve cushions, giving authorities room to act again. Yet intervention can only buy time. A more durable recovery in the yen will depend on interest-rate expectations, inflation and whether the Bank of Japan can continue normalising policy without unsettling an economy where growth remains fragile.