The yen strengthened into the 155-per-dollar range on 09-04, from around 157 the day before, on speculation that the Bank of Japan will hike faster than expected on 09-18 and that yen-funded carry trades are being unwound.
The carry trade is the FX channel through which a Tokyo rate decision reaches US risk assets: yen-funded positions in US equities and Treasuries are closed when the yen appreciates, and the closing itself pushes the yen higher, so a BOJ hike that markets start to price is self-reinforcing in the currency before the meeting happens. The standing snapshot names the BOJ/JGB leg as its open gap and carries the 09-18 meeting only as a probability; this is the first read of the mechanism that turns that probability into a US position-liquidation risk rather than a Japanese rates story.
Scenarios 2
The BOJ delivers a quarter-point on 09-18, the yen extends through 150, and the unwind shows up as a US equity drawdown concentrated in the AI cohort that the US data cannot explain — the chip decoupling of 09-04 reverses on a Tokyo decision, not a Washington one.
Checkable in the sequence: a yen move that precedes rather than follows a US equity move, with the semiconductor index leading the downside. The August 2024 episode is the template.
Precedent — 5 August 2024: after the BOJ's July hike and a weak US payrolls print, the yen carry unwind took the Nikkei down 12.4% in a day and the S&P 500 down 3%; the BOJ's deputy governor walked back further hikes within two days and the move retraced. Documented mode, same central bank, same channel.
The yen move stalls in the 155 range, the BOJ hikes or holds without a market accident, and the episode is recorded as Japan repricing its own curve — no transmission to US risk assets beyond a day.
Checkable in whether the 09-18 decision produces any US equity or Treasury move attributable to it in the coverage of that day; the standing snapshot's US-Fed framing would then hold.
Context
Written against a rate_regime snapshot that still frames September through the Fed alone and names the BOJ/JGB leg as an open gap; the 10-year JGB above 3% (first crossed 09-01), Ueda's every-meeting language and Takata's hawkish remarks are all on the record here only as critic-caught misses. The thread this bullet lands on was opened by this pass; the snapshot itself is /week's to refresh.
Threads 1
This is generated reasoning, not a sourced fact — the mechanism and scenarios above are the model's read on what this item could mean for capital flows, tagged with its own confidence rather than stated as settled. Back to Global Capital.