Yen

Donald Trump extended the Israel-Lebanon ceasefire by three weeks on Thursday, pushing the 26 April expiry to mid-May. For speculators holding a yen short built to pay out on that discrete binary, the event has not dissolved; it has moved, into the same fortnight as Scott Bessent’s scheduled Tokyo stopover on his way to Mr Trump’s summit with Mr Xi in China. The shift matters because the dollar-yen floor at 160 is held not by any change in Japanese interest rates but by a new bilateral arrangement. Satsuki Katayama, Japan’s finance minister, threatens intervention; Mr Bessent, US treasury secretary, endorses her by declining to contradict her in public. This is the intervention-acquiescence model: US tacit consent to Japanese currency defence, in lieu of the January pressure on the Bank of Japan to raise rates. ...

There are two kinds of statement a finance minister makes: the spoken and the withheld. When America’s treasury secretary, Scott Bessent, met his Japanese counterpart, Satsuki Katayama, in Washington on 15 April, the unspoken carried the weight. When the two last met, in January, the Treasury’s readout noted that Mr Bessent “emphasized the need for sound formulation and communication of monetary policy”, diplomatic code for pressing the Bank of Japan to raise rates. That sentence is absent from the April readout. Ms Katayama, for her part, told reporters that the two ministers had not discussed monetary policy. ...

Scott Bessent worked at Soros Fund Management across two stints between 1991 and 2015, doing one thing supremely well: spotting the moment when a central bank had mispriced risk and the speculative position on the other side was too large to unwind gracefully. When that moment came, the correction was violent. The people positioned for it made fortunes. Bessent was one of the best. Now he runs the US Treasury. Japan holds roughly $1.2 trillion of American government debt, the largest foreign position — a mix of official reserves and private institutional holdings. If the yen weakens far enough, the private side of that equation starts to shift: life insurers and pension funds find hedging costs too high to justify holding US bonds, and new purchases dry up. US borrowing costs rise. ...

Japan’s budget passed. The ceasefire is collapsing. Katayama’s intervention window is open for the first time since she took office.

In 1274, a Mongol-Korean invasion force landed at Hakata Bay in northern Kyushu. Japan’s samurai, trained for single combat, were routed by massed formations wielding gunpowder weapons they had never seen. A storm forced the invaders to withdraw, but the lesson was plain: the existing military model would not survive a second attempt. The Kamakura shogunate spent the next seven years preparing. It built a 20km stone seawall along Hakata Bay, developed small-boat night-raiding tactics and established Japan’s first permanent coastal defence force. When a far larger invasion arrived in 1281, the seawall held. The Mongol fleet sat offshore for weeks, unable to land. Then a typhoon struck and finished what Japanese preparation had started. ...

Japan holds 254 days of oil in reserve. That number has been repeated so often since 28 February that it has become a kind of talisman, proof that the country can absorb anything the Strait of Hormuz throws at it. It is also misleading. On 16 March, Prime Minister Takaichi ordered the largest oil reserve release in Japanese history: 80 million barrels, equivalent to 45 days of domestic consumption. The draw came from both private and government stockpiles and was coordinated with a 400-million-barrel IEA-wide release across 32 member nations. Japan’s contribution was the second largest after the United States. ...

Somewhere between $250 billion and $4 trillion, a ghost lives. The yen carry trade (borrow cheaply in Japan, invest where yields are higher) has been the subject of a strange argument since the August 2024 unwind sent the Nikkei down 12% in a single session. One camp says the trade is dead. The other says it never left. Both cite data. Both sound confident. They cannot both be right, and at USD/JPY 160.46 with the vice finance minister invoking “resolute measures” for the first time in his tenure, the answer has stopped being academic. ...

Predicting when a finance minister will intervene in the currency market is a fool’s errand. The MOF does not publish a schedule. The whole point of intervention is surprise: catching speculators wrong-footed, inflicting maximum pain per yen spent. Anyone claiming to know the date is selling you something. And yet. The decision to intervene is not made in a vacuum. It requires political clearance, diplomatic coordination and tactical conditions that do not appear on demand. These constraints are visible. They can be mapped against a calendar. The result will not be a date circled in red but a window, the period during which the political stars align and the MOF gains the freedom to act. ...

On Thursday morning, the Japanese Ministry of Finance released its weekly International Transactions in Securities data covering 1 to 7 March, the first full week of the Iran war. Within hours, a widely shared post on X announced: the BOJ had sold ¥400 billion in foreign bonds. The carry trade was still unwinding into the oil shock. This reading is wrong on every count. The data in question comes from Section 1 of the MOF release: Portfolio Investment Assets, which tracks transactions by Japanese residents, not the Bank of Japan. The BOJ’s foreign reserve operations are excluded from this dataset entirely. The ¥400 billion figure was a net purchase of foreign long-term debt securities by Japanese institutional investors. Positive in Section 1 means net acquisition, not net disposition. The sign convention changed in January 2014: plus now denotes buying, not selling. ...

The Bank of Japan’s policy board meets on 18 March–19 with the overnight rate at 0.75%, the highest in thirty years. The market expects a hold. The decision itself is not the story. The language is. Two forces are pulling in opposite directions, and the words the BOJ chooses to describe the balance between them will determine whether April remains a live meeting or whether the next hike slips to June or beyond. ...