To The Moon

Wall Street is bracing for a pivotal moment as the upcoming US August CPI report, scheduled for release next Friday, will likely determine whether the Federal Reserve can restart its rate hike campaign at this month's policy meeting. Major financial institutions are sharply divided on how to interpret the forthcoming data, with Bank of America Securities projecting the figures will be robust enough to justify a September hike, while Citi anticipates further cooling in core inflation that would keep the Fed on hold.

Bank of America Securities forecasts a 0.22% month-over-month increase in core CPI for August, corresponding to a core PCE reading of approximately 0.24% and pushing the annual rate to 3.4%. The firm argues this level would be sufficient to convince Fed Chair Warsh that inflation remains inadequately controlled, thereby supporting another rate increase. According to the trading desk analysis, Bank of America views the August CPI as the critical battleground for the September hike decision.

Conversely, Citi predicts core CPI will rise only 0.184% month-over-month, bringing the annual rate down to 2.3%. If realized, this would mark the lowest annual core CPI reading since it first surpassed 2% in April 2021, a figure that would likely persuade most officials to maintain the current policy rate. Meanwhile, some analysts warn that if CPI comes in hotter than expected, combined with super-core PCE inflation already elevated at 3.9% and a strong August jobs report, the Fed could be compelled to adopt a more aggressive tightening path. This scenario might involve pushing rates above 5% and deliberately inverting the yield curve, which would exert significant downward pressure on US equities.

The Critical Threshold: Waller's Vote Carries Weight

The September rate decision hinges considerably on the vote arithmetic within the Fed. Analysis suggests the hawkish and dovish factions are evenly balanced, with Governor Waller viewed as the pivotal swing vote. Waller previously told Reuters that he would support maintaining the current policy rate if inflation continues making progress toward the 2% target, explicitly identifying the August inflation data as the key determinant for his decision. The Bank of America report notes that Warsh delivered a clearly hawkish signal at the Jackson Hole symposium, seemingly lowering the bar for another rate increase, while Williams and Waller have adopted relatively dovish stances.

According to Bank of America's analysis, Waller's implied threshold is that he would only support a hike if August core PCE exceeds 0.30% month-over-month. Their forecast of approximately 0.24% falls below this threshold, yet the firm believes that if Warsh backs a hike and the data broadly meets expectations, a sufficient majority within the committee could still form to support another rate increase. Citi, on the other hand, argues that following Waller's recent comments, the market's threshold for deeming inflation "too hot" has shifted upward—any data that rounds to a 0.2% monthly increase would likely be considered moderate enough for most officials to support a pause.

Divergence at the Core: CPI and PCE Tell Different Stories

The fundamental source of disagreement between these forecasts lies in the structural differences between CPI and PCE—two inflation metrics currently depicting contrasting narratives. Housing carries approximately one-third weight in the CPI basket, while PCE assigns significantly less weight to shelter. Over the past year, cooling housing inflation has been the primary driver pulling core CPI lower and the main reason for the widening spread between the two measures.

Simultaneously, PCE places greater weight on healthcare and includes Medicare, Medicaid, and employer-paid medical expenditures, whereas CPI primarily measures out-of-pocket consumer costs. Consequently, rising healthcare costs are pushing core PCE higher, particularly the super-core measure. The Cleveland Fed's inflation nowcasting model indicates core CPI is expected to decline further to 2.3% in September, approaching the Fed's 2% target, while core PCE is projected to rise to approximately 3.5% over the same period—a clear divergence in trajectories.

Fed Chair Warsh confirmed at Jackson Hole that PCE inflation serves as the Fed's preferred policy reference metric, with particular attention to super-core PCE—the services inflation measure excluding energy and housing. This indicator has climbed to 3.9% and continues rising, reflecting persistent wage-driven services inflation pressure.

Energy and Employment: Two Cards Strengthening the Hawks' Hand

Regardless of the final CPI outcome, the August jobs report has already provided substantial support for the hawkish camp. Non-farm payrolls added 162,000 jobs in August, far exceeding the expected 55,000, with annualized wage growth reaching 3.1%. This data was released after Waller's comments, meaning the Fed must now recalibrate its assessment of wage-inflation dynamics with this new information in hand.

On the energy front, both Bank of America Securities and Citi anticipate a rebound in August energy prices following several months of declines, pushing overall CPI up approximately 0.34% to 0.37% month-over-month, with the annual rate climbing further from July's 3.4% level. Analysts point to ongoing Middle East tensions, the Strait of Hormuz remaining closed to normal traffic, and continuously declining global oil inventories. Should energy prices surge dramatically, the impact would extend beyond headline inflation—potentially transmitting through wage-price spirals into core readings and reinforcing the Fed's tightening pressure.

Rate Hike Expectations Rekindle, Stock Markets Face Headwinds

For investors, the market implications of this CPI report are equally significant. The S&P 500 currently trades at a Shiller P/E ratio exceeding 42 times, placing it in bubble valuation territory—a level historically associated with late-cycle economic phases and further amplified by the AI capital expenditure boom. Analysts warn that if the Fed is forced into a more aggressive tightening path, pushing rates above 5% and deliberately inverting the yield curve, US equities would face substantial P/E compression risk.

Bank of America Securities maintains that even if the composition of August inflation data doesn't trigger major alarm, it is unlikely to provide sufficient justification for the committee to delay a rate increase. The September 11 data release represents the most critical test yet for near-term Fed policy direction. Following the CPI, August PCE data will be published at the end of September, two weeks after the Fed's rate decision.

Citi notes that this particular PCE release carries higher-than-usual uncertainty due to methodological adjustments the Fed has made to certain key components. This means the conventional mapping from CPI and PPI data to PCE calculations has become less clear this month. Additionally, five years of historical PCE data will undergo revision, with expectations that core PCE annual rate will be revised down by more than 30 basis points to approximately 3.0%. These technical factors add complexity to interpreting the final PCE reading.

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