Here's an uncomfortable thought: What if the entire U.S. economy is basically just riding on one very big, very speculative wave? That's the warning from investor and author Ruchir Sharma, who thinks America's decade-long run of "exceptionalism" might be hitting a dangerous peak.

When One Story Takes Over Everything

In a recent appearance on the Bankless podcast, Sharma, who serves as CIO of Breakout Capital, laid out a sobering thesis: the United States has effectively become "one big bet on AI." And unlike diversifying your retirement portfolio across multiple sectors, this kind of concentration creates vulnerabilities that most people aren't paying attention to.

The numbers he shared are striking. About 40% of U.S. economic growth this year comes directly from capital expenditure on building AI infrastructure. Think data centers, chips, cloud computing—the physical backbone of the AI revolution. On top of that, nearly 80% of the stock market's recent gains are tied to AI-related plays. Strip away that "maniacal focus" and the wealth effect it creates, and Sharma suggests the economy underneath might actually be sputtering.

The Fiscal Problems Hiding Behind the Hype

It gets more interesting when you look at what all this AI excitement might be covering up. Sharma points out that the U.S. is running a fiscal deficit above 6% of GDP, with national debt now exceeding 100% of GDP. Those are the kinds of numbers that would normally make global investors nervous.

But they're not nervous. Why? Because there's an implicit belief that an AI-driven productivity boom will eventually solve the debt problem. Investors are giving America a "free pass" on deficits, and even on potential economic headwinds from tariffs or tighter immigration policy, all because of this faith in AI's transformative power.

When asked directly whether markets are in a bubble, Sharma didn't hedge. Yes, he said, defining the current moment as "a good story that's gone too far." He noted that bubbles don't usually pop on their own—they need a catalyst. In this case, he thinks that catalyst could be a resurgence of inflation that forces the Federal Reserve to tighten monetary policy again, ending the party abruptly.

How to Protect Yourself From Concentrated Bets

"If the AI boom was not happening, the economy would be weaker," Sharma acknowledged. That's not exactly reassuring when you think about what happens if the AI narrative stumbles.

His advice? Look beyond U.S. borders. The "gap of outperformance" between American markets and international ones is finally starting to close, he says. He's pointing investors toward undervalued opportunities in China, India, and recovering European markets like Greece—places where valuations haven't been inflated by AI mania.

It's the old investing wisdom: concentration creates wealth, but diversification preserves it.

Market Snapshot and AI Exposure

Despite these warnings, U.S. markets were trading higher on Monday following a positive close on Friday. The SPDR S&P 500 ETF Trust (SPY) and Invesco QQQ Trust ETF (QQQ), which track the S&P 500 and Nasdaq 100 respectively, both closed higher. SPY rose 1.00% to $659.03, while QQQ advanced 0.75% to $590.07.

For investors looking to maintain exposure to AI or hedge their bets, here are some U.S.-listed AI-linked ETFs to consider:

The question isn't whether AI will be transformative—most experts agree it will be. The question is whether America has bet so heavily on that transformation that any stumble becomes an economic crisis. That's the risk Sharma is highlighting, and it's one worth thinking about even if markets keep climbing.