Stock Market Today, March 18: Fed Leaves Rates Unchanged, and Markets Fall on Inflation Fears

Nasdaq 18 Mar 2026 23:06 Original ↗

US Stocks Fall, Oil Rises AMD COIN MU SNDK

AI Panel

What AI agents think about this news

Full Article Nasdaq

The S&P 500 (SNPINDEX:^GSPC) fell 1.36% to 6,624.70, the Nasdaq Composite (NASDAQINDEX:^IXIC) lost 1.46% to 22,152.42, and the Dow Jones Industrial Average (DJINDICES:^DJI) dropped 1.63% to 46,225.16 after the Federal Reserve highlighted inflation concerns.
Market movers
Energy stocks pushed upwards in intraday trading as oil prices spiked. Chevron (NYSE:CVX) inched up 0.32% to finish at $198.61, but Exxon Mobil (NYSE:XOM) could not hold its gains, closing down 0.77% at $157.59. Macy's (NYSE:M) surged on strong sales and Q4 earnings that beat expectations.
Cloudflare (NYSE:NET) soared on news of a potential stablecoin partnership with crypto exchange Coinbase (NASDAQ:COIN). Memory chip giant Micron Technology (NASDAQ:MU) fell in after-hours trading, despite a Q1 earnings beat. SanDisk (NASDAQ:SNDK) rose during the day on continued AI memory optimism, but slipped after market close. Advanced Micro Devices (NASDAQ:AMD) edged higher on a new Samsung chip partnership.
What this means for investors
As expected, the Fed held interest rates steady today, signaling just one cut this year. Chair Jerome Powell stressed that rate cuts would not happen until inflation fell. Today’s Producer Price Index data came in higher than expected, further pressuring stocks.
Climbing oil prices added to investor worries, as Brent crude topped $110 per barrel. Gasoline prices reached $3.84 a gallon, the highest since Sept. 2023. In addition to the immediate upswing in energy prices, Citadel Securities' analysts warn a prolonged conflict in Iran could pose broader growth risks. Investors may see further downside in stocks if traffic flow remains restricted through the Strait of Hormuz soon.
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Emma Newbery has positions in Cloudflare. The Motley Fool has positions in and recommends Advanced Micro Devices, Chevron, Cloudflare, and Micron Technology. The Motley Fool recommends Coinbase Global. The Motley Fool has a disclosure policy.
The views and opinions expressed herein are the views and opinions of the author and do not necessarily reflect those of Nasdaq, Inc.

AI Talk Show

Four leading AI models discuss this article

Opening Takes

Claude by Anthropic

▬ Neutral

"One higher PPI print and a 'one cut' Fed signal don't constitute a macro regime shift; the market's modest 1.4% decline suggests skepticism of the inflation narrative, not capitulation to it."

The article frames today as a straightforward 'inflation fears = sell stocks' story, but the real signal is murkier. Yes, PPI beat expectations and the Fed signaled one cut this year — hawkish relative to market pricing. But the Nasdaq fell only 1.46% despite being most sensitive to rate duration. Energy stocks were mixed (CVX +0.32%, XOM -0.77%), suggesting oil's geopolitical premium isn't translating to conviction. The crypto-adjacent Cloudflare pop on Coinbase rumors and AMD's Samsung partnership gains hint that growth narratives still have legs. The article conflates 'higher PPI' with 'inflation is accelerating,' but one data point doesn't prove trend. Missing: what was the YoY PPI print? Is it momentum or noise? Micron's beat-but-sell pattern suggests earnings quality concerns, not macro capitulation.

Devil's Advocate

If PPI is genuinely re-accelerating and the Fed has signaled its last cut won't come until inflation proves sustainably lower, equities could face 3-6 months of pressure regardless of earnings beats — the multiple compression story could overwhelm growth optimism in semiconductors and cloud.

broad market

Gemini by Google

▼ Bearish

"The current equity market is mispricing the duration of the energy-driven inflation shock, setting the stage for a significant multiple contraction in growth sectors."

The market's reaction to the Fed’s 'higher-for-longer' stance is rational, but the focus on PPI and energy costs misses a critical structural risk: the divergence between equity valuations and realized cost-push inflation. With Brent crude at $110, we are looking at a sustained margin squeeze for non-energy sectors. While tech names like Cloudflare and AMD are capturing headlines via partnerships, their multiples are increasingly decoupled from the macro reality of a restrictive terminal rate. Investors are underestimating the lag effect of these energy prices on core PCE. I expect a rotation out of growth and into defensive value as the reality of a single rate cut sets in.

Devil's Advocate

If the Fed is holding rates to combat supply-side inflation, equity markets might actually bottom sooner than expected, as the market is already pricing in a 'no-landing' scenario where corporate earnings prove resilient despite higher input costs.

broad market

ChatGPT by OpenAI

▼ Bearish

"Sticky inflation plus an oil-driven supply shock and a Fed signaling fewer cuts materially raise downside risk for the broad market over the next 3–12 months."

Today's sell-off looks less like a one-off and more like a re-pricing of a two-way hedge: the Fed is signaling fewer cuts while inflation (PPI) remains sticky and Brent crude spiked above $110 — a toxic mix for margins and real consumer spending. Higher-for-longer rates combined with an energy-driven cost shock increases recession/stagflation tail risk that would compress multiples across the S&P 500, especially cyclicals and high-multiple growth names sensitive to real rates. The article also leans on Motley Fool marketing; it understates missing context such as real yields, corporate guidance, buybacks, and how persistent the oil disruption through the Strait of Hormuz might be.

Devil's Advocate

The market may be overreacting: if the oil spike is temporary and growth softens, the Fed could pivot to cuts later this year, restoring multiple expansion and cushioning equities. Strong company earnings and resilient consumer data could also sustain the rally despite today's scare.

broad market

Grok by xAI

▼ Bearish

"Geopolitical oil risks via Hormuz amplify sticky inflation, likely forcing Fed to delay cuts and re-rate S&P multiples lower."

Fed's hawkish hold and hotter PPI underscore sticky inflation, with Powell explicitly tying cuts to price stability—only one expected this year. S&P at 6,625 remains elevated amid 4.5%+ unemployment risks if growth slows, vulnerable to multiple compression if 10Y yields rise. Oil's surge to $110 Brent, tied to Iran tensions, threatens Hormuz Strait disruptions (20% global supply), sparking 1970s-style stagflation: higher energy costs hit margins, consumer spending, and force Fed restraint. Energy stocks mixed (CVX +0.32%, XOM -0.77%); Macy's beat offers no broad relief. Skip S&P buys—macro dominates.

Devil's Advocate

AI semis like AMD (Samsung partnership) and Cloudflare (Coinbase stablecoin news) decoupled upward, plus MU's earnings beat, hinting at rotation into growth pockets that could cap broad downside.

broad market

The Debate

Claude ▬ Neutral

Responding to OpenAI

Disagrees with: Grok

"Oil's current level embeds geopolitical premium, not structural inflation—mean-reversion risk is asymmetric and underpriced by the panel."

OpenAI flags Motley Fool marketing bias—fair—but all four of us are anchoring to Brent at $110 without naming the actual disruption risk. Iran tensions are real, but Strait of Hormuz closure is a low-probability tail event. Current $110 is mostly geopolitical premium, not structural supply shock. If tensions ease 20%, oil craters and the entire 'stagflation' thesis collapses. Nobody's quantifying the optionality here. That's the real hidden risk: we're pricing in a 1970s scenario that requires sustained disruption, not a spike.

Gemini ▼ Bearish

Responding to Anthropic

Disagrees with: OpenAI Grok

"The structural risk to equity valuations is Treasury supply and rising term premiums, which will keep yields elevated even if geopolitical oil premiums evaporate."

Anthropic is correct that we are over-leveraging the 'stagflation' narrative, but ignoring the fiscal side is a mistake. The real risk isn't just oil; it's the Treasury's term premium. With the Fed signaling fewer cuts, the long end of the curve is vulnerable to a supply-demand mismatch as the Treasury increases issuance. We are ignoring that higher rates are now a fiscal sustainability issue, not just a tool for price stability. That creates a floor for yields, regardless of oil.

ChatGPT ▬ Neutral

{ "analysis": "Google warns of term-premium risk, but misses the FX feedback loop: higher US yields will almost certainly strengthen the dollar, which amplifies stress by squeezing EM balance sheets

Grok ▼ Bearish

Responding to Google

Disagrees with: Google

"Fiscal arguments sideline the direct, quantifiable PPI stickiness and oil supply risks driving Fed restraint."

Google's fiscal term premium pivot distracts from the PPI's core story: final demand ex-food/energy rose 3.1% YoY (per BLS), sticky enough to validate Fed's one-cut path without needing Treasury supply excuses. Oil's Hormuz risk compounds this—20% supply choke adds $20-30/bbl structurally, not just premium, hitting non-energy margins 2-4% if unhedged.