US and Japan face inflation and “behind-the-curve” risks: the US may shift toward rate hikes and QT, while Japan needs to correct its weak-yen-inflation dilemma

Overview

Nomura Chief Economist Richard Koo examines how the United States and Japan can address inflation and the risk of falling behind the monetary-policy curve, drawing on the Fed’s July FOMC meeting, the structure of the US economy, the outlook for quantitative tightening, and coordinated US-Japan FX intervention. The report interprets the Fed’s recent inaction as an interim step to observe genuine market responses and build political and market justification for subsequent tightening.

Core views

Although the Fed has held rates unchanged for two consecutive meetings, three dissenting votes in favor of rate hikes and broad increases in market interest rates raise the probability of a hike at the next meeting.Warsh emphasizes observing the market’s “reaction function” when there is no forward guidance or policy action; the report believes this process shows market concern that the Fed will fall behind the inflation curve if it does not act.Beyond the policy rate, QT may become a core component of Warsh’s anti-inflation policy, operating through liquidity contraction and higher long-term interest rates.Overall US economic resilience is driven mainly by AI-related data-center investment, with associated capital expenditure reportedly growing at an annualized rate of about 20%; however, employment and household consumption remain fragile, increasing economic divergence.Japan’s weak yen raises food and energy prices and pushes up Japanese government bond yields. The report argues that FX intervention is only one of the remaining tools; the more fundamental solution is for the Bank of Japan to confront inflation and normalize monetary policy, while using fiscal policy to address the private sector’s financial surplus.

Analysis framework

The report uses policy-event interpretation and macroeconomic transmission analysis, incorporating FOMC voting divisions, changes in the interest-rate term structure, statements on balance-sheet policy, regional Fed Beige Book employment information, AI capital-expenditure trends, and the backdrop of coordinated US-Japan FX intervention. Some discussion of Warsh’s policy intentions and his relationship with the Trump administration represents the author’s personal speculation rather than verified facts.

Methodology notes

• Monetary PolicyMarket Reaction Function

  Observing market changes when the central bank provides no information and takes no action

  The report views the rise in short- and long-term rates during the policy-silent period as market pricing of inflation and policy lag, and accordingly concludes that markets want the central bank to take stronger tightening action.

• Monetary PolicyQuantitative Tightening (QT)

  Tightening financial conditions through balance-sheet and liquidity channels

  The author believes QT may be used alongside rate hikes, or serve as a tool to curb inflation and raise long-term interest rates when policy rates are not immediately increased.

• MacroeconomicsBalance Sheet Recession

  Insufficient demand caused by sustained private-sector deleveraging under debt burdens

  Using Japan’s experience after the bursting of its bubble, the report explains that when the private sector is net saving and reducing debt, monetary easing alone may not effectively stimulate borrowing and demand, making fiscal policy necessary.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• US Treasuries

  Policy-tightening expectations and QT will affect the yield curve

  Strengths

  Economic resilience can be maintained if AI capital expenditure continues to support growth.

  Weaknesses

  Markets have already priced in higher rates in response to inflation and Fed policy lag.

  Comparison

  Short- and long-term, nominal and real interest rates all rose during the policy-silent period.

  Risks

  Rate hikes, QT, recurring inflation, and geopolitical energy shocks could further depress long-term bond prices.

• USD/JPY

  A weak yen is the key variable behind coordinated US-Japan intervention and Japan’s inflation pressure

  Strengths

  US participation in intervention reflects its concern that exchange rates affect industrial competitiveness.

  Weaknesses

  If the Bank of Japan continues to lag in policy, the yen will remain under depreciation pressure.

  Comparison

  This coordinated US-Japan support for the yen is described as the first in about 28 years.

  Risks

  FX intervention has limited effectiveness; if interest-rate differentials and policy expectations remain unfavorable to the yen, depreciation and imported inflation may recur.

• Japanese Government Bonds

  Inflation and rising yields triggered by a weak yen affect room for fiscal expansion

  Strengths

  If monetary-policy normalization restores inflation credibility, yield pressure may ease.

  Weaknesses

  Rising inflation has already pushed up Japanese government bond yields and threatens expansionary fiscal policy.

  Comparison

  The report links Japan’s current situation to the typical case in which a central bank falls behind the inflation curve, causing long-term interest rates to rise.

  Risks

  Further yield increases, concerns over fiscal sustainability, and delayed policy adjustments.

Key data

• FOMC dissenting votes supporting rate hikes3/12The July meeting kept the policy rate unchanged, but three of the 12 voting members supported rate hikes.
• Interval between two FOMC meetings42 daysThe report uses changes in market interest rates during this period as a window for observing market reactions.
• Annualized growth in AI-related data-center capital expenditure20%This was the growth rate cited by Warsh at the press conference, and the report treats it as an important source of US economic resilience.
• US July nonfarm payroll change-23,000The report states that the July employment report showed an unexpected decline in employment and that June job growth was revised down.
• Interval since coordinated yen interventionAbout 28 yearsThe report states that the last coordinated US-Japan action to support the yen dates back to 1998.

Impact & implications

For markets, the balance of interest-rate policy risks is tilted upward: if the US-Iran issue remains unresolved, inflation concerns persist, or market interest rates continue rising, expectations for Fed rate hikes and QT may strengthen, pressuring long-term bonds. US growth’s reliance on AI investment means that a slowdown in AI capital expenditure could materially weaken macroeconomic resilience. In Japan, further yen depreciation would intensify imported inflation and pressure on Japanese government bond yields, increasing the need for policy normalization and renewed FX intervention.

Risks

• If US-Iran negotiations make progress and drive oil prices lower, the urgency of precautionary rate hikes may decline.
• Some of the author’s interpretations of Warsh’s strategy and political considerations are speculative, and the policy path remains uncertain.
• If AI investment-driven growth slows, it may expose continued weakness in US household consumption and employment.
• FX intervention cannot replace sustained monetary and fiscal policy adjustment, and pressure on the yen may recur.
• Geopolitics, energy prices, and changes in trade policy could simultaneously alter the inflation and growth outlook.

What to watch

• The next FOMC rate decision, voting divisions, and inflation-related language.
• Specific Fed signals on the balance sheet, reserve supply, and the scale and pace of QT.
• US short- and long-term real interest rates, inflation expectations, and changes in demand for long-term bonds.
• Whether AI data-center capital expenditure, employment data, and trends of downtrading in household consumption persist.
• US-Iran negotiations, passage through the Strait of Hormuz, and oil-price trends.
• The yen exchange rate, Bank of Japan policy communications, Japanese government bond yields, and whether further coordinated intervention emerges.