Why Stocks Fell Sept 29: Iran, Yields, Boeing

What Happened

Bond yields surged across the curve Monday as President Trump rejected Iran's latest peace proposal, keeping oil prices elevated and raising the specter of persistent inflation. The 10-year Treasury yield touched 5.24%, its highest level since 2007, while the 30-year climbed to 5.56%, a level not seen since 2004. Markets are now pricing in a 70% chance the Fed will hike rates again in October.

Why It Matters

Rising borrowing costs threaten to choke off economic growth and squeeze corporate profits. Higher yields make stocks less attractive and mortgage rates more painful for homebuyers. If oil stays high and the Fed keeps tightening, the risk of a policy mistake—tipping the economy into recession—grows significantly.

Market Impact

What Happened

The Federal Aviation Administration announced it won't certify Boeing's 737 Max 10—the last variant of its best-selling jet family—until it assesses a newly discovered software issue affecting landing procedures. Boeing had expected approval within weeks. Shares tumbled nearly 7%, their worst day in recent memory, as investors worry about delivery delays and lost market share to Airbus.

Why It Matters

The Max 10 is critical to Boeing's recovery after years of safety crises and production setbacks. Every month of delay pushes airlines toward Airbus and erodes Boeing's cash flow. This setback intensifies scrutiny on the company's quality control and raises questions about when—or if—Boeing can regain its footing in the narrowbody market.

Market Impact

What Happened

Federal Reserve Governor Lisa Cook told a tech conference in Oakland that AI-driven infrastructure spending—data centers, chips, and power—is fueling broad inflation, with utility costs up 5% over the past year. She warned that productivity gains from AI won't arrive in time to offset near-term price pressures, and she backed the Fed's recent rate hike, saying the labor market can handle tighter policy.

Why It Matters

This is a clear signal the Fed sees inflation risks broadening beyond just energy. If AI investment—a pillar of the current bull market—is now being flagged as inflationary, the central bank may keep raising rates even as tech investors hope for a pause. That sets up a potential clash between Fed policy and market expectations.

Market Impact

What Happened

Nvidia unveiled a $150 billion increase to its share repurchase program—the largest single buyback authorization in US history—bringing its total authorization to $235 billion. CEO Jensen Huang said the company's massive cash flow from the AI boom gives it room to invest in new technologies and return capital to shareholders. The stock rose 1.7% Monday, bucking the broader tech decline.

Why It Matters

Buybacks signal management confidence, and Nvidia's move suggests leadership sees the stock as cheap at a trailing P/E of around 30—its lowest valuation in four years. With analysts expecting earnings to nearly double this fiscal year, the buyback could provide a floor for the stock. But it also raises questions about whether Nvidia has exhausted its best growth opportunities.

Market Impact