Yen gives up ground: market prices in 84% probability of a Bank of Japan rate hike in September
The derivatives market and prediction platforms have recorded a sharp reversal in expectations regarding Japan's monetary policy. In just two weeks, the probability of a rate hike by the Bank of Japan at the September meeting has surged from 22% to 84%. This is a signal that cannot be ignored: market participants no longer believe in the effectiveness of one-off interventions and are demanding decisive action from the regulator.
Failed interventions: the yen retreats to lows
The reason for such a sharp shift in sentiment is the obvious weakness of the Japanese authorities' currency interventions. This week, the yen lost about 1% against the dollar, falling to 159.43. This is the worst weekly result since May. Notably, the currency has already given back roughly half of the gains that followed the coordinated intervention by the Bank of Japan in late July and early August, when the exchange rate held near 164 yen per dollar.
History repeats itself: after the April intervention, the yen slid back to a 40-year low over several months. The market seems to have learned this lesson. Former top currency diplomat of Tokyo, Mitsuhiro Furusawa, states outright: authorities could tap currency reserves at any moment, but officials are also ready to signal a faster rate hike to support the national currency. Under current conditions, the monetary lever appears more effective than targeted currency injections.
Betting on the central bank's resolve
The link between interventions and key rate decisions is now obvious to all players. OCBC strategist Sim Moh Siong rightly notes that interventions alone will not reverse the yen's dynamics. "It's no surprise that the yen has given up ground again," he comments. For a sustained strengthening of the Japanese currency, clear support from the Bank of Japan is needed, ready to tighten monetary policy, especially amid inflation approaching the target level.
The opposite scenario carries serious risks. If the regulator leaves the rate unchanged, the market will react with immediate disappointment—the yen has already shown drops to 160 per dollar after similar decisions. Currently, market participants are betting on the central bank's steps rather than on new interventions.
My view: the 84% probability looks overstated and reflects more the market's emotional mood than the Bank of Japan's real intentions. The regulator is traditionally cautious and is unlikely to raise rates without sustained confirmation of inflationary pressure. Nevertheless, if the rate is indeed raised, it will become a powerful trigger for yen strengthening and put pressure on the Japanese stock market, which will indirectly affect global cryptocurrency flows.