Beyond the Immediate, Back to the Substantive: Japanese Goldilocks
22/09/2026
The news cycle has rotated away from intervention in the Japanese yen, while Brent has returned to what is now considered the slightly less alarming level below $100 a barrel.
This week will likely be dominated by Thursday’s Trump-Xi meeting and growing speculation around another attempt at a deal with Iran, whilst in Midtown NYC the UN speeches likely to consume the headlines are from President Trump on Tuesday, Iran’s President Pezeshkian on Wednesday and Israeli Prime Minister Netanyahu on Thursday.
These developments are of immediate consequence, but seem to have been somewhat factored into the price relief we are seeing. This seems like a sensible moment to consider what may happen when the cycle turns again – in particular with Japan.
Scott Bessent remarked yesterday that bonds have become unusually correlated with energy. Perhaps they have, but his own actions suggest that unusual can sit comfortably alongside understandable.
Japan is a significant transmission mechanism: a major exporter of financial capital, a major importer of physical resources and the largest foreign holder of US Treasuries.
Japan’s physical dependency remains substantial. The comparison with 2022, at the height of the Ukraine-related commodity price shock, is instructive.
Japan import bill | 2022 | 2025 | Change |
Petroleum | ¥13.5tn | ¥9.6tn | -29% |
Coal | ¥7.8tn | ¥3.3tn | -57% |
Raw materials | ¥8.1tn | ¥7.6tn | -6% |
Agricultural products* | ¥9.2tn | ¥9.8tn | +7% |
*Agricultural products use the MAFF definition
Sources:
The path into that 2022 peak is equally instructive. Between 2021 and 2022, Japan’s agricultural import bill rose 31%, despite relatively modest changes in volumes. Maize volumes barely moved while their yen cost rose 47%; wheat volumes rose 4% while their cost rose 68%.
Source:
A weaker yen therefore increases the domestic cost of Japan’s physical requirements before the underlying commodity price has moved.
This is the tension embedded in Japan’s external balance sheet.
A weaker yen increases the domestic value of Japan’s enormous overseas financial assets but simultaneously increases the cost of the physical resources it must continually purchase.
The problem is not necessarily a weak yen - it is a yen that becomes too weak.
Which brings us back to Bessent.
Washington has been encouraging Japan towards higher interest rates. At first glance, that is a curious position for the world’s largest borrower. Higher Japanese yields make domestic assets more attractive and potentially reduce the incentive for Japanese capital to seek returns in America.
Yet Bessent has repeatedly pressed Japan towards tighter policy.
The contradiction makes more sense as a choice between risks.
For decades, ultra-low Japanese rates encouraged savings overseas; US assets provided the yield.
There are broadly two ways that relationships can now deteriorate:
Manageable:
BoJ tightening → higher JGB yields → Japanese assets become more attractive → reduced marginal demand for Treasuries.
Dangerous:
Excessive yen weakness → imported inflation → intervention and/or more aggressive tightening → reserve adjustment, forced unwinds and potentially much greater repatriation.
Bessent’s actions suggest he is acutely aware of the second risk. Washington’s willingness to support the yen, alongside its encouragement of higher Japanese rates, looks less contradictory when viewed in those terms.
The preference is effectively to tolerate some erosion of future Japanese demand if it reduces the risk of a much more disorderly reversal of Japanese capital.
The objective is a Japanese Goldilocks zone, with rates high enough to prevent destabilising yen weakness, but not so high that Japanese capital loses its incentive to remain overseas.
The difficulty is that this zone is narrowing.
Energy and materials are becoming more expensive. AI is placing another enormous claim on power, copper, infrastructure and capital. At the same time, America’s expanding debt requires ever more of that same global capital.
Japan sits awkwardly between the two.
It needs the physical resources whose prices are rising while supplying some of the financial capital America increasingly needs.
President Trump’s desire for materially lower US interest rates adds another complication. If US rates fall while Japanese rates rise, the differential contracts from both directions.
That should support the yen. But it also erodes the yield advantage that helped attract Japanese savings into US assets.
And easier US policy does not necessarily mean cheaper long-term financing. If it raises inflation or currency concerns, investors can simply demand greater compensation for lending long.
The Fed controls the short-term price of money. It does not control the price at which the world is prepared to lend to the US for ten or thirty years.
This is why Japan may prove more consequential to the sustainability of the current price paradigm than the headlines currently occupying markets.
Another period of commodity escalation would tighten the vice.
High commodity prices can be tolerated, enormous investment requirements accommodated and expanding sovereign borrowing accepted, but only while the capital remains available to finance them.
Japan is where this is most visibly being tested, and the alternative to accommodation may be the sharp correction in prices that everyone fears.
Important Disclaimer
This article is intended for general information purposes only and reflects the market environment at the time of writing. It does not constitute investment advice, a personal recommendation, or an offer to engage in any trading activity. The content does not take into account individual objectives or circumstances and should not be relied upon as the basis for any investment decision. Past performance is not a reliable indicator of future results.
Content may have been created by persons who have, have previously had, or may in the future have personal interests in securities or other financial products referred to therein. All conflicts and potential conflicts relating to our business are managed in accordance with our conflicts of interest policy. For more information, please refer to our Summary of Conflicts of Interest Policy.
For more information and important risk disclosures, please see our Derivative Product Trading Notes and Privacy Policy. AMT Futures Limited is authorised and regulated by the Financial Conduct Authority.
Comments