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Japan’s currency authorities are locked in an increasingly costly struggle to defend the yen, as the dollar creeps back toward the 160-level that triggered emergency intervention just three weeks ago — raising fresh fears that Tokyo may be forced to act again.
A Red Line Crossed
When the dollar climbed above 160 yen in late April, Japanese authorities stepped in to buy yen and sell dollars for the first time in nearly two years. The move sent shockwaves through currency markets, with the dollar plunging sharply from above 160.50 yen to briefly dip below 156 — one of the most dramatic single-session swings the pair had seen in years. A second round of suspected intervention followed days later, signaling that Tokyo was prepared to keep pulling the trigger.
A $35 Billion Firewall
The scale of the operation was substantial. Authorities deployed roughly 5.4 trillion yen — equivalent to around $34.5 billion — well above the average spent on each of Japan’s four intervention rounds throughout 2024. Officials subsequently put markets on notice that speculative positions remained active, warning traders that further action could come at any moment.
The Gains Are Fading Fast
Three weeks on, the relief is wearing thin. The dollar pushed back toward 158.90 yen on Monday, marking a sixth consecutive session of losses for the Japanese currency. TradingView data tells the full story: the weekly close settled at 158.598, with a tight day’s range of 158.362 to 158.703, while the five-day performance shows the dollar gaining 1.32% against the yen. Moving averages are aligned in a broadly neutral signal, yet price action shows little sustained downside follow-through from the intervention levels — a sign that buying pressure on the dollar remains intact beneath the surface.
Why Intervention Alone Cannot Win This War
The fundamental problem remains unchanged. A gap of up to 300 basis points between U.S. and Japanese interest rates continues to fuel the carry trade, where investors borrow cheaply in yen and reinvest in higher-yielding dollar assets. The Bank of Japan has meanwhile cut its 2026 growth forecast to just 0.5% while raising its inflation outlook to 2.8%, leaving policymakers caught between the need to raise rates and the risk of further damaging an already fragile economy. Intervening in the currency market without adjusting monetary policy addresses the symptom while leaving the underlying disease untreated.
What Comes Next
Market participants are staying alert to the possibility of another intervention, particularly after Japanese officials suggested there are no limits on how frequently authorities can step into the foreign exchange market. With oil prices elevated, the rate gap wide, and the yen having surrendered roughly half its intervention gains over the past year — down 8.94% on a twelve-month basis — the question is no longer whether the 160 level will be tested again, but whether Tokyo will be ready when it is.
BoJ
