MOF

Go to any Japanese supermarket and pick up a round box of Snow Brand Megmilk’s “6P Cheese.” Open it and you will find six silver-wrapped wedges of processed cheese arranged like pie slices. The product has been sold in Japan since 1954 – a national staple that appears in children’s lunchboxes, office bento and late-night snacks with a beer. Every Japanese person knows it. When 6P Cheese launched in 1954, a box weighed 170g and each wedge was 19mm thick. In 2026, it weighs 102g and the wedges are 11mm. The diameter of the round box has not changed. Only the contents have shrunk: 40% over 70 years. ...

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. ...

In a long-form interview from the Treasury’s Cash Room on 13 March, a week before the worst single-session bond selloff of his tenure, Bessent compared himself to a lifeguard. Drowning people pull you under, he told the interviewer. Your goal is always to save them. For fourteen months he has had solid ground. When JGB yields spiked in January on fiscal fears around the Takaichi snap election, he called Tokyo and the stress faded within days. When the carry trade wobbled in January, a Fed rate check on dollar-yen was enough. Those problems originated in places he could reach. ...

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. ...