Unexpected shock under rate pause: why US stocks plunged despite Fed standing pat?

Keywords: Federal Reserve; rate decision; US stock plunge; market expectations; Powell speech; hawkish signal; dot plot

Introduction

In September 2024, the Federal Open Market Committee (FOMC) announced as expected to keep the federal funds rate target range at 5.25%-5.50% unchanged, the second consecutive pause since the last rate hike in July 2023. The market had widely anticipated this, but the subsequent US stock market performance was surprising: the S&P 500 fell 1.21%, the Nasdaq Composite dropped nearly 1%, the Dow Jones Industrial Average also fell nearly 1%, the FANG+ index declined over 1%, and large tech stocks were almost all in the red—actually plunged into a bloodbath. This phenomenon of "expectations realized but sold off" deeply reveals the high sensitivity and subtle divergence of the current market regarding the interest rate outlook. This article will analyze the underlying logic behind this "plunge without a rate hike" from four levels: details of the Fed's decision, hawkish signals in Powell's speech, market expectation deviation, and structural risks.

I. Fed decision: expected "pause" and unexpected "hawkishness"

On the surface, the Fed's decision to keep rates unchanged was "no surprise." Since the September meeting, the US 10-year Treasury yield has continued to climb, briefly breaking the 5% level, significantly tightening financial conditions; meanwhile, while core CPI remains well above the 2% target, it has fallen from its peak, and the labor market shows signs of cooling. The market generally believed the Fed needed to "observe more data" before deciding the next move.

However, the real focus of this meeting was not the rate decision itself, but the updated Summary of Economic Projections (SEP) and the dot plot. The dot plot showed that the median projection for the federal funds rate at the end of 2024 remained in the 5.5%-5.75% range, meaning the possibility of a rate hike still exists in the remaining two meetings (November and December), and the distribution of hawkish members has increased. More importantly, the median projection for 2025 was revised up to 4.5%-4.75%, significantly higher than the market's previous expectation of around 4.0%. This "higher for longer" rate path assessment directly impacted the market's optimistic expectations for a policy pivot.

In the subsequent press conference, Powell did not explicitly say there would be a rate hike in November, but he repeatedly emphasized phrases like "inflation is still too high," "the labor market remains tight," and "need to see more evidence that inflation is coming down sustainably," and pointed out that "the rise in long-term yields is not a direct substitute for monetary policy and cannot replace rate hikes." These statements essentially negated the market's previously popular narrative of "the rate hike cycle has ended," instead conveying a tough stance of "we retain the right to act and are not in a hurry to ease."

II. Market expectation deviation: cognitive correction from "last time" to "one more time"

The most fundamental driver of this US stock plunge was the systemic error in the market's expectations of the Fed's policy path. Before the September meeting, federal funds futures pricing showed the market placed only about a 25% probability of a November rate hike and even lower for December; more aggressively, some traders even bet on rate cuts in mid-2024. This "optimistic premium" was reflected in US stock valuations, especially in rate-sensitive tech and growth stocks.

But the Fed's dot plot and Powell's remarks completely shattered this fantasy. When the market realized that "the last rate hike" might become "one or even two more," and rate cuts were pushed further into 2025, investors were forced to adjust positions. This adjustment was amplified in late trading with lower liquidity: the interest rate futures market experienced violent fluctuations, with 2-year and 10-year Treasury yields rising to multi-year highs of 5.15% and 4.82% respectively, and real yields (TIPS) breaking 2.5%, a level not seen since 2008.

High rates directly depressed the intrinsic value of stocks. For tech stocks, the discounted cash flow valuation model for many companies is highly dependent on a low-rate environment. For every 25-basis-point rise in the discount rate, valuation adjustments can reach 3%-5%. Additionally, large tech stocks (like FANG+ components) had already accumulated significant unrealized gains, creating profit-taking pressure; coupled with the hawkish shift in rate expectations, funds rotated from growth stocks to defensive sectors, resulting in a "broad decline" pattern—many S&P 500 components fell over 1%, and Nasdaq heavyweight stocks like Apple, Microsoft, Amazon, and Nvidia recorded notable declines.

III. Structural issues emerging: the Fed's "data dependence" dilemma and market trust rift

At a deeper level, behind this market volatility is a crack in communication and trust between the Fed and the market. Since misjudging inflation as "transitory" in 2021, the Fed's credibility has been in a repair process. However, this time, although Powell did not hike rates, he conveyed a stronger signal through the dot plot and language. His "data-dependent" strategy has essentially evolved into an "expectation management art"—making the market neither dare to overprice rate cuts nor ignore rate hike risks.

The side effect of this strategy is that the market overreacts to any hawkish signal. Before the September meeting, the market had hoped to see the Fed hint at "ending the rate hike cycle" or "earlier rate cuts," but the reality was a reverse correction. This gap caused a sharp spike in short-term volatility (VIX), briefly breaking above 20 points. Meanwhile, the Treasury's debt issuance pressure did not ease: net issuance in the fourth quarter is expected to exceed $1.5 trillion, with large supply pushing up long-term rates, resonating with the Fed's hawkish stance.

Worryingly, the impact of high rates on the real economy is becoming evident. The September ISM Manufacturing Index was in contraction for the 11th consecutive month, business investment slowed, and the housing market remained depressed. If the Fed insists on a "higher for longer" path, the market's expectation of a "soft landing" may quickly turn into "hard landing" concerns. Once economic data deteriorates, downward revisions in corporate earnings will hit the stock market, forming a negative feedback loop.

IV. Outlook and investment implications

This "plunge without a hike" event is actually a typical "expectation game" between the Fed and the market. Historical experience shows that in the final stage of a rate hike cycle, the market often falls into violent volatility triggered by "expectation correction": once good expectations (rate cuts, end of hiking) are disappointed, indices decline at a steeper slope. The US stock crash in Q4 2018 is a precedent, when the Fed hiked in December with a hawkish dot plot, directly causing a maximum drawdown of over 20% in the S&P 500.

Looking ahead, the main risk for US stocks is no longer whether the Fed will hike, but "how long rates will stay high." If inflation experiences a second rebound due to rising oil prices or service sector resilience (i.e., "second-wave inflation"), the Fed may even be forced to resume hiking, putting greater valuation pressure on the market. Conversely, if economic data weakens significantly, the market may start "trading rate cuts" again, but this is unlikely in the short term.

For investors, the current phase should reduce allocation to growth and tech stocks, shifting to defensive sectors (such as utilities, healthcare), while focusing on the safe-haven value of cash and short-duration bonds. Before the Fed's policy clearly pivots, every "hawkish scare" could be a buying opportunity—but only if you have enough patience to wait for bottom signals.

Conclusion

The Fed's inaction triggered a US stock plunge, which on the surface is a classic "buy the rumor, sell the fact" case, but actually reflects a sharp shift in market expectations for the rate path from optimism to caution. The hawkish upward revision of the dot plot, Powell's tough rhetoric, and the "higher for longer" narrative together shattered the market's fantasy of an easing cycle. In the complex context of stubborn inflation, tight labor market, and slowing growth, the Fed faces a "wanting both" dilemma, while the market repeatedly corrects and fluctuates violently in the fog of information. Only by staying clear-headed and deeply understanding policy logic and pricing mechanisms can investors hold their ground in this round of rate games.