Yen Intervention Exposes Tangled Web of Oil, Debt, and Interest Rates

The recent US-Japan intervention to support the Japanese yen has exposed a complex financial triangle that connects Japan's dependence on Middle Eastern oil, its massive holdings of US government debt, and the interest-rate gap driving investors towards the dollar.

Japan and the US jointly intervened on July 31 after the yen neared its weakest level against the dollar in four decades. The currency climbed about 5%, moving from nearly 164 yen per dollar to around 155, but had retreated to 159.36 by August 11. According to Bank of Japan account data, Tokyo may have spent as much as $58.97 billion.

The Iran war has exacerbated Japan's predicament, as the country obtains approximately 95% of its crude-oil imports from the Middle East. Higher energy prices increase Japan's need for dollars, while a weak yen makes every imported barrel more expensive. Tokyo has released oil reserves and sought alternative supply routes, but the underlying currency problem remains.