October 6, 2026, (Inside AI) — Nvidia is closing in on a $6 trillion market valuation, a threshold no company has ever crossed, as the Nasdaq notched another record close on Monday. The surge came even as long-term U.S. Treasury yields climbed to their highest level since 2002, a combination that puzzles analysts who expected rising borrowing costs to cool the AI-driven rally.
The AI investment boom is now the primary engine of U.S. economic heat, according to market analysts. Data center construction, semiconductor manufacturing, and related infrastructure spending are generating inflationary pressure that is complicating the Federal Reserve's rate path. The Institute for Supply Management's September services survey showed the prices-paid component at a four-year high, suggesting that AI-related demand is spilling into broader inflation.
"The two climbing together, the only thing that ties them really is that the economy is beginning to generate heat, particularly in the AI sector and data center build-outs and all of the related manufacturing that goes with that," said Mike Dolan, markets columnist at Reuters, on the Reuters Morning Bid podcast.
The simultaneous rise in tech stocks and bond yields signals a fundamental shift. Investors are betting that AI capital expenditure will continue to drive earnings growth, even as the cost of capital increases. Nvidia's ascent to a near-$6 trillion valuation would make it the most valuable company in history, surpassing Microsoft and Apple. The chipmaker's dominance in AI accelerators has made it the bellwether for the entire sector.
Behind the scenes, complex financing arrangements are emerging to sustain the AI buildout. A recent deal between Broadcom and Anthropic, structured with Wall Street banks, illustrates how chipmakers and AI developers are collaborating to fund massive infrastructure projects. These deals often involve special purpose vehicles and debt structures that blur the line between hardware sales and financial engineering.
Bond Markets Flash Warnings
Billionaire investor Ray Dalio warned on Monday that U.S. Treasuries are vulnerable to a pullback in demand from Japan and China, the two largest foreign holders of U.S. debt. Dalio reiterated his view that the U.S. faces a debt crisis within three years. His comments added to unease in bond markets, where 10-year and 30-year yields have reached multi-decade highs.
"We do appear to be at a moment. So you can take two sides of that. Are we just normalizing back to where we were 25 years ago or so? Or are we in a new territory that's unsustainable?" Dolan said. "I think we're certainly at a crunch point."
The scale of U.S. government debt is staggering. Marketable securities total roughly $32 trillion to $33 trillion, with total debt exceeding $40 trillion. As Japanese government bond yields rise to their highest in decades, Japanese investors may repatriate capital, reducing demand for U.S. and French bonds. Japan's exit from decades of near-zero interest rates is prompting a reassessment of global yield-seeking strategies.
French markets are particularly exposed. Japanese investors have been major holders of French government bonds (OATs), and reports of liquidation by large Japanese institutions jolted the French market late last week. If home bias returns, the U.S. and France could face higher borrowing costs.
"If Japanese yields are normalizing back to where they would have been 30 or 40 years ago, is there now an argument that Japanese money goes home, essentially?" Dolan asked. "And in going home, what markets are vulnerable? People would point to the French market in particular."
In Europe, the European Central Bank is monitoring the situation. French Finance Minister Bruno Le Maire said on Tuesday that it was not yet the moment for the ECB to intervene. However, the political backdrop is fraught. Marine Le Pen, the leading candidate for France's April presidential election, is proposing €25 billion in annual spending cuts, a plan that could reshape the budget debate and unsettle markets further.
Brazil's Bolsonaro Rally
In Brazil, markets surged on Monday as Flávio Bolsonaro, son of former President Jair Bolsonaro, emerged as the favorite ahead of the October 25 presidential runoff. The Bovespa benchmark index jumped nearly 8%, its best day since 2020, while the real and government bonds also rallied.
Investors are betting that a Bolsonaro victory would lead to deregulation, lower government spending, and interest rate cuts. However, analysts caution that Brazil's fiscal challenges are deep-seated, and campaign promises may be difficult to implement. The runoff election will be closely watched for its impact on Latin America's largest economy.
As earnings season kicks off in the coming weeks, all eyes will be on AI capital expenditure guidance from hyperscalers. The market's resilience in the face of rising yields suggests that investors are prioritizing AI growth over macroeconomic risks. But with debt levels at historic highs and geopolitical tensions simmering, the rally faces multiple tests.
For now, the AI trade remains the dominant force on Wall Street. Whether it can withstand the pressure from bond markets and political uncertainty is the central question for the fourth quarter.
