On Tuesday (November 10), a stellar inflation report, coupled with hawkish signals from Federal Reserve Governor Wall Street before the data release, forced Wall Street's attention to shift from the sustainability of AI trading to an older enemy: excessive tightening. Neil Dutta, head of economic research at Renaissance Macro Research, pointed out after the data release that "excessive policy tightening is a major risk." His reasoning was simple: the unemployment rate was falling, the labor market was stabilizing, and core inflation had been nailed to a 0.3% month-on-month increase for the third consecutive month, further deviating from the Fed's 2% target. When these three variables converge, the Fed's room for maneuver is being systematically compressed, and the assumption that "the policy brake is about to be loosened," upon which stock market valuations rely, is simultaneously crumbling.

I. The "0.3% Anchor" for Core Inflation: Not Just Monthly Noise, But a Three-Month Trend

Data released by the U.S. Department of Labor on November 10 showed that the Consumer Price Index (CPI) rose 0.4% month-over-month in October, higher than the market expectation of 0.3%. The core CPI, excluding food and energy, rose 0.3% month-over-month, also exceeding the expected 0.2%, and maintaining this rate of increase for the third consecutive month since August. Due to the interruption of federal government funding in October 2025, resulting in missing survey data, this report did not provide year-over-year readings, making the month-over-month trend the only available high-frequency anchor. More unsettling for the market is the structural spread of inflationary pressures. Housing costs rose 0.3% month-over-month, contributing more than 30% to the overall CPI increase that month; food prices rose 0.5%, transportation services saw a further increase to 0.8%, and healthcare goods prices, after several months of decline, also rose 0.5%. In a client report, Dutta specifically pointed out the renewed acceleration in housing rents, arguing that if housing price increases do not slow, "bringing inflation back to 2% will become very difficult." In other words, the 0.3% month-on-month core CPI reading itself is not alarming, but its nature changes when it occurs against the backdrop of an unemployment rate falling to 4.1%, non-farm payrolls increasing by 165,000, and the labor market continuing to recover. It is no longer "noise at the sticky tail of inflation's decline," but increasingly resembles evidence that "overheating on the demand side has not yet been adequately curbed by policies."

II. Waller's 50 Basis-Point Options: From "Impossible" to "Tabletop Issue"

Hours before the CPI data release, Federal Reserve Governor Christopher Waller's speech in London set the tone for the day's market reaction. He explicitly stated that if the October core CPI rose by around 0.3% month-on-month or higher, then the December meeting "should consider raising the policy rate by 50 basis points." This condition was triggered after the data release. Waller's logic pointed to the central bank's credibility function, rather than simply inflation forecasts. He stated that raising rates by only 25 basis points "would put our credibility at risk, and I'm not willing to take that risk." This means that the discussion of 50 basis points was not based on the Fed's recalculation of the final interest rate, but on a more complex judgment: if the market begins to doubt the Fed's "small steps" approach despite three consecutive months of core inflation at 0.3%, then inflation expectations themselves could become unanchored. Dallas Fed President Logan's remarks on the same day further reinforced this direction. She believed the Fed "needs at least two more 25-basis-point rate hikes," and that "the pace of rate hikes this winter could be faster than this fall." Two rate hikes would push the target range for the federal funds rate from the current 3.75%–4.00% to 4.25%–4.50%, which Logan described as having a “mild restraining effect on the economy.” The problem is that the market had previously priced in two hikes, one in December and one in March of next year; Logan’s “winter acceleration” suggests that the timeline may be moved forward.

III. The bond market has already "voted with its feet": a revaluation of short-term US Treasury bonds.

While the stock market decline was relatively mild on the day, the signals from the bond market were far more dramatic. The yield on the 2-year US Treasury note, most sensitive to policy rates, jumped 18.46 basis points on November 10th to 4.742%, marking its largest single-day increase since April 2025; the 10-year yield rose 11.17 basis points to 4.996%, and the 30-year yield rose 7.74 basis points to 5.357%. This "bear market flattening," with short-term gains far exceeding long-term gains, points to a clear pricing shift: the market is not trading on "higher and longer inflation," but rather is being forced to re-anchor the timing and magnitude of the Fed's resumption of rate hikes forward. The CME FedWatch Tool's pricing after the data release showed that the probability of at least a 25 basis point rate hike in December rose to 100%, with a near 10% probability of a 50 basis point hike. In other words, the market is no longer debating "whether to raise rates," but rather "how much to raise" and the subsequent path in 2027. Dutta's assessment is that reversing the 75-basis-point "insurance rate cut" to be implemented in 2025 is only the "minimum requirement," and the current interest rate is still too low to have a significant impact on prices.

Fourth, the vulnerability of the stock market lies not in AI itself, but in the discount rate upon which AI relies.

Following the release of October's CPI data, all three major U.S. stock indexes closed lower. The S&P 500 fell 0.38% to 7520.93 points, the Nasdaq Composite fell 0.74% to 25065.87 points, and the Dow Jones Industrial Average fell 0.30% to 52231.89 points. Nvidia fell 5.53% in a single day, becoming the leading decliner among tech stocks. This price reaction provides a clue that is easily misinterpreted. On the surface, it seems that "interest rate hike expectations are suppressing tech stocks"; however, the deeper mechanism is that the core valuation logic of artificial intelligence trading is highly dependent on the discounting of forward cash flows, and the denominator of the discount rate is being directly pushed up by the jump in short-term U.S. Treasury yields. When the 2-year yield rises by nearly 18 basis points in a single day and approaches the previous high of 5%, the pressure on the theoretical valuation of long-duration growth stocks will be released before the Fed actually implements a 50 basis point rate cut. Dutta's warning is noteworthy precisely because he extended the timeframe of the risk to 2027, rather than just discussing the December meeting. If the Federal Reserve is forced to shift from "insurance rate cuts" to "compensatory rate hikes" given a persistently low core inflation of 0.3%, then the stock market in 2027 will face not just valuation compression, but a discount environment where the policy interest rate center is systematically raised. In this environment, even if the AI narrative itself is not disproven, the valuation multiples it supports will be continuously eroded.

Editor's Summary

The current combination of US macroeconomic data—core CPI at 0.3% for three consecutive months, unemployment at 4.1%, and non-farm payrolls at 165,000—does not point to an economy on the verge of recession, but rather to an economy where demand resilience has not been fully contained and inflationary stickiness has spread from a single energy shock to housing and services. Under this combination, the Fed's response function is shifting from "when to cut rates" to "whether to push rates into the restrictive range at a faster pace." Waller's 50-basis-point option and Logan's "at least twice" are not isolated hawkish statements, but rather public signals of this shift in function. For stock investors, the real risk lies not in whether a particular rate hike will materialize, but in the fact that the market's previously implicit assumption of a "steady decline in policy rates until 2027" is being overturned one by one by short-term pricing in the bond market. Dutta places "excessive policy tightening" above the sustainability of AI trading. The value of his analysis lies not in predicting a recession, but in reminding people that when the labor market is strong, inflation is not falling, and the Federal Reserve has no reason to "loosen monetary policy," the "friendly central bank" scenario on which stock valuations depend is itself the most vulnerable link.

Frequently Asked Questions

Q: Why is a 0.3% month-on-month increase in core CPI enough for the Fed to discuss a 50 basis point rate hike? A 0.3% monthly increase translates to an annualized rate of only 3.6%, which doesn't seem extreme. A: The core issue isn't the absolute level of the monthly reading, but rather its continuity and the underlying context. A 0.3% month-on-month increase in core CPI for three consecutive months means that the annualized core inflation rate over the past quarter has been around 3.6%, rather than converging towards 2%. Meanwhile, the unemployment rate has fallen to 4.1%, and non-farm payrolls increased by 165,000, indicating that the economy doesn't need monetary policy to "protect" it. Given the combination of a strong labor market and persistent inflation, if the Fed continues to act in 25-basis-point increments, the market might interpret it as having excessive tolerance for inflation, thus pushing up inflation expectations. Waller's proposal of a 50-basis-point rate hike is precisely to create a sufficiently clear policy signal before damaging his credibility. Therefore, the 0.3% rate triggering a 50-basis-point discussion isn't because 0.3% itself is particularly high, but because it appears in a macroeconomic context that "shouldn't be there." Q: Dutta says that "overly tight policy" is the biggest risk to the stock market in 2027. Does this contradict the current rising expectations of interest rate hikes? Isn't the purpose of interest rate hikes to suppress inflation? A: No, they are not contradictory. Interest rate hikes are a tool of the Federal Reserve, while "overly tight" is a judgment on the strength of the tool's use. Dutta's logic is that current interest rates are still too low. Even if rates are raised twice to 4.25%-4.50%, it would only be a "mild restraint," not a deep tightening. However, if core inflation remains sticky beyond expectations, the Federal Reserve may be forced to push interest rates up in 2027 to a level sufficient to significantly suppress demand and even trigger downward revisions in earnings. At that time, the stock market will face dual pressures: the denominator (discount rate) will remain high due to the rise in the policy interest rate center, while the numerator (corporate profits) will be under pressure due to rising financing costs and cooling demand. This "double whammy" scenario is different from the benign narrative of "interest rate hikes suppressing inflation." The former is the tail risk that Dutta is referring to. Q: Why is housing cost singled out as a key variable? How is it different from other inflation components? A: Housing costs have the highest weighting in the US CPI and exhibit extremely strong trend persistence. In October, housing costs rose 0.3% month-on-month, contributing over 30% to the overall CPI increase. Unlike short-term fluctuations in energy or food prices, once rents and landlord-equivalent rents establish an upward trend, they fall very slowly because the repricing cycle for lease contracts is measured in years. Dutta's concern is that if housing rent increases "accelerate again," then even if energy prices continue to fall and commodity inflation cools, core inflation will be propped up by the housing component at a level well above 2%. This means the Fed cannot rely on "supply-side normalization" to wait for inflation to fall on its own, but must indirectly affect housing inflation by suppressing aggregate demand—this is the source of the risk of "over-tightening." Q: The market has already priced in a December rate hike probability of over 80%. Does this mean the risk has been fully priced in? A: Probability pricing and path pricing are two different things. CME Group data shows that the probability of a 25 basis point rate hike in December rose to over 84% after the data release, indicating that the "December action" event itself has been largely priced in. However, the risk is not concentrated on whether a rate hike will occur in December, but rather on the slope of the interest rate path in 2027. Before the October CPI data, the market's implied pricing for 2027 included a certain expectation of a "pause after a rate hike, or even a reassessment of rate cuts." After the CPI release, the jump in short-term US Treasury yields and the flattening of the yield curve indicate that the market is removing the "pause" option and instead pricing in a more sustained tightening cycle. Furthermore, while the 50 basis point tail option is not highly probable, if it does materialize, its impact on the discount rate will be far more linear than the two 25 basis point hikes. Therefore, a "high probability of a rate hike" does not equate to "risk already priced in." On the contrary, once the event itself is fully priced in, the unexpected extension of the path is the main source of damage. Question: If AI trading itself still holds true, why is a rate hike a greater risk than "the disproving of the AI narrative"? A: Because the valuation of AI trading is highly sensitive to the discount rate, and assets sensitive to the discount rate will systematically compress their multiples in an environment of rising interest rates, even if earnings forecasts remain unchanged. Dutta is not denying the industry logic of AI trading; what he is pointing out is the change in the risk hierarchy: from 2025 to the first half of 2026, the market's main anxiety is "whether AI capital expenditure can be converted into sustainable profits," which is a problem on the numerator side. However, with core inflation refusing to decline for three consecutive months and the Federal Reserve being forced to push policy rates to higher levels, the problem on the denominator side is becoming more urgent than on the numerator side. The valuation loss of a long-duration growth stock when the discount rate rises by 100 basis points may far exceed the amount that its earnings exceeding expectations can compensate for. More importantly, if the central interest rate is structurally raised, this compression is not a one-off event but will continuously suppress the space for valuation repair. Therefore, "the AI narrative will not be disproven" does not constitute sufficient protection for the stock market; when the discount rate environment changes directionally, even the best narrative may be diluted by higher capital costs.