Ahead of the release of the September U.S. CPI data, Wall Street forecasts for headline inflation have largely converged, but on the composition and risk direction of core inflation, three major institutions — Morgan Stanley (MS.US), Nomura (NMR.US), and Citigroup (C.US) — have shown sharply different logical perspectives.
Morgan Stanley's View: Airfare and Hotel Prices Pose Upside Risk
Morgan Stanley forecasts September headline CPI at 0.62% month-over-month and 3.69% year-over-year, a judgment driven mainly by another sharp rise in gasoline prices. For core CPI, Morgan Stanley gives a month-over-month forecast of 0.24%, slightly above the Bloomberg survey average estimate of 0.22% at the time. Although Morgan Stanley's assessment still includes an expectation that core inflation will slow from the previous month, it believes the degree of slowing may be limited. The more critical variable lies in the probability distribution of risk direction: Morgan Stanley sees a higher likelihood of core CPI printing at 0.3% than at 0.1%. This upside risk stems mainly from airfare and hotel prices. Structurally, if these services components come in stronger than expected, they could push an already near-rounding-threshold core reading even higher. Therefore, the key to understanding Morgan Stanley's view is whether certain service prices can offset cooling in other components. If airfare and hotel gains are strong, core CPI may fall short of market expectations even if it slows overall. Strength in a narrow set of services components and broad-based price acceleration still need to be assessed separately. If the data comes in hot, whether the drivers are concentrated will affect how the market interprets the persistence of inflation. Data compiled by Woofun AI shows that Morgan Stanley's baseline forecast is slightly hot, with airfare and hotel prices posing a significant upside risk to core CPI.
Nomura's View: Telecom Services Price Distortion Is Fading
Nomura forecasts September headline CPI at 0.58% month-over-month and core CPI at 0.227% month-over-month, below August's 0.290%. Its explanation for the core inflation slowdown is very specific: the upward push previously coming from wireless telecommunications services prices is diminishing. This means that August's relatively high core reading was partly driven by the telecom services component. As this effect fades, the September reading is expected to pull back. Nomura's analytical focus thus falls on the sources of monthly price fluctuations: to judge the inflation trajectory, one needs to identify which gains may persist and which are temporary disturbances. In terms of forecast figures, Nomura is slightly below Morgan Stanley and above Citigroup. All three expect core gains to slow from the previous month, but Nomura emphasizes the exit of a previously boosting factor. Nomura's assessment suggests that a pullback in core CPI can first be driven by the fading of a component-level disturbance, and does not necessarily mean that all price pressures are easing in tandem. If telecom services cool while housing, airfare, or hotels remain strong, the final reading could still hover around 0.2%; the performance of other components will determine whether the cooling can broaden further.
Citigroup's View: Housing and Broader Services Prices Are Cooling
Citigroup forecasts September headline CPI at 0.62% month-over-month and core CPI at 0.18% month-over-month, the lowest core forecast among the three. Compared with Morgan Stanley, Citigroup's judgment on the direction of surprises is the opposite: it believes the risk of core CPI printing at 0.1% is higher than the risk of it printing at 0.3%. Three main factors support this assessment: housing inflation is still slowing, overall services price gains are relatively moderate, and the pass-through of energy costs to goods prices is limited. Whether housing can continue to cool is an important clue for testing Citigroup's judgment. Airfare and hotels may bring single-month volatility, but if housing and other services components perform moderately, the overall gain in core CPI may still be contained. The pass-through of energy costs determines another question: to what extent will gasoline price increases extend into core goods? Citigroup expects this pass-through to be limited, so headline CPI rising and core CPI cooling can occur simultaneously. The forecast combination it provides reflects exactly this: headline CPI up 0.62% month-over-month, core CPI up only 0.18%. In Citigroup's assessment, energy driving headline inflation higher is not sufficient to indicate that broader price pressures are re-intensifying.
Three Key Observations: Where the Institutions Diverge
The differences among the three institutions can be reduced to three observation focal points: Morgan Stanley watches the upside risk from airfare and hotels, Nomura watches the fading telecom services disturbance, and Citigroup watches the cooling of housing and broader services prices. This also explains why a single 0.2% core CPI reading may not be enough to end the debate. If housing slows noticeably but airfare and hotels remain strong, the cooling factors emphasized by Citigroup and the upside risks feared by Morgan Stanley could appear simultaneously; if the core reading pullback comes mainly from telecom services, it would be closer to Nomura's explanation of component disturbance fading, and the judgment on broader inflation trends would still need support from other data. If core CPI ultimately prints at 0.3%, the result would be closer to the direction Morgan Stanley fears, but whether it represents intensifying sustained pressure depends on whether the gains are broad-based. If it prints at 0.1%, it would be closer to Citigroup's risk assessment, and one would similarly need to observe whether the cooling is concentrated in a few components. The core question of this CPI round is which side — upward pressure on services prices or cooling in housing — has a greater impact on the final reading. The three institutions' baseline forecasts are similar, yet they give different answers on the sources and persistence of price pressures.
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