〔Overnight Brief〕BoJ Priced for 1.25% With 10Y JGB at 2.99% and Yen at 153, But M2 Near 2% Says Tightening Is Already Binding - Japan, US, UK Decide in Seven Days

0. Weekly Arc

A triple central bank decision week opens with Japan in the lead: consensus has the BoJ lifting the policy rate from 1% to 1.25% on Sept 17-18, the 10-year JGB near 2.99% and the yen at ~153, recovered from ~164 in July ^[1]. Yet the M2 pulse at ~2.0% YoY in August is structurally short of what's needed to sustain a 2% inflation target, framing the hike as a tightening on an already tight money stock ^[1]. Net: a market priced for normalization confronting a money supply that says the cycle is closer to the end than the start ^[1][2].

1. BoJ Policy: The M2 Trap

• **[NEW] Consensus: 25bp to 1.25% on Sept 17-18:** the yen has firmed to ~153 and the US Treasury has publicly backed yen strength and coordinated intervention ^[1]. 2027 could see accelerated follow-on hikes ^[1].
• **[NEW] Citi: read the dissent count, not the headline:** the marginal signal is the number of Board dissents, which tells you how far the majority thinks it can go ^[2].
• **[ESCALATED] Rate-money supply gap:** Japan M2 YoY at ~2.0% in August (2.2% in July) sits under the level required to support a 2% inflation target, so each additional hike risks binding the very money stock the BoJ says it wants to expand ^[1]. Single-source analytical framing - flag for verification.
• **[NEW] Side note:** Japan's Cabinet PR office has requested ~7.2 billion yen for FY2027, roughly 10x its ~0.7 billion FY2026 budget, drawing media questions over the scale of the request ^[3].

2. Global Liquidity: Risk-Off Cools, EM Shrugs

• **[NEW] Week to Sept 9:** global equity funds took $9.42B net inflow (39.8% percentile since 2025), global bond funds $17.32B (48.9%), China equity funds $1.63B (73.9%) - a swing from a $4.65B outflow the prior week ^[4]. Money market fund inflows fell $36B+, dragging their percentile to 43.2% ^[4].
• **[NEW] Read:** the marginal cooling of the safety trade into a soft bid for equities and credit frames the macro backdrop as risk-neutral rather than risk-on ^[4].
• **[NEW] Emerging markets:** have absorbed war, $100 oil and rising US Treasury yields this year, and investors see room for the rally to extend even with US hike risk back on the table, per Bloomberg ^[5]. Treat as a tape observation, not a forecast.

3. UK: External Drag, Domestic Pitch

• **[NEW] Autumn budget backdrop:** Chancellor John Healey is drafting the autumn budget against debt-servicing costs inflated by Trump's policies, per the Guardian ^[6]. Column framing - quote the framing, not the conclusion.
• **[NEW] PM-business summit:** PM Burnham will host AI, fintech, healthtech, manufacturing and quantum leaders Monday, pledging a "growth partner" role and a cultural shift in how UK business operates ^[7].

4. Calendar and What Would Falsify the M2 Trap

• **Today (Sept 14, Monday):** Canada August CPI m/m at 20:30 ^[8]; New Zealand's August services PMI printed 51.2 vs 50.6 prior ^[9].
• **This week:** BoJ Sept 17-18 (1.25% priced), plus the Fed and BoE, in a seven-day window with surging inflation as the common backdrop ^[1][10].
• **Falsifiable test:** if the BoJ delivers 1.25% with two or more dissents and the yen holds 153 or firmer, the M2-skeptic case is in play; if the yen weakens back through 160, the consensus trade reasserts ^[1][2].