Stock market volatility rises as AI investment doubts and inflation concerns weigh on U.S. equities
U.S. stocks slipped from recent highs amid slowing AI revenue growth, rising inflation, and investor caution over interest rates, signaling increased market fragility.
Recent Stock Market Decline After All-Time Highs
Just one week after hitting fresh all-time highs, U.S. stocks are showing signs of strain as investors begin to fret about returns on the trillions of dollars that have been put into AI. After trading closed Thursday, the S&P 500 was off 1% from its week-ago record, while the tech-heavy Nasdaq had fallen more than 3% below its peak last week. The S&P 500 currently sits at about 7,600.
Role of AI Investment in Market Gains and Current Doubts
Quarterly revenue growth at Anthropic has slowed, the Financial Times reported Wednesday. Nearly half of all U.S. economy growth this year is attributable to tech-related spending. Those investments have also lifted the stock market even as a growing swath of other companies have experienced sharp declines in their share prices. The tech-driven gains have in turn created a wealth effect that has helped propel steady U.S. consumer spending and, by extension, the job market.
Inflation and Interest Rate Pressures
On Thursday, economist Ed Yardeni lowered his year-end target for the S&P 500 to 7,900, down from 8,400, over rising investor caution about the artificial intelligence trade and lingering doubts about inflation and higher interest rates. The Bureau of Labor Statistics reported Thursday that inflation among businesses reached its highest rate since December 2022.
Impact on Consumer Spending and Broader Economy
The result has been sturdy economic growth, even as lower-income and even middle-income households have continued to struggle under stubborn inflation and declining earnings. If tech spending — and stocks — show any sign of sustained declines, broader U.S. economic growth would likely be at risk.
Expert Outlook and Revised Market Targets
Ed Yardeni, a widely respected market commentator, adjusted his year-end forecast for the S&P 500 downward to 7,900 from a previous target of 8,400, citing growing investor caution around AI investments and persistent concerns about inflation and interest rates. This revision reflects heightened uncertainty about the sustainability of AI-driven market gains amid slowing revenue growth at key players like Anthropic.
The S&P 500 was trading around 7,600 at the time of the forecast update, placing it below Yardeni’s revised target but still within striking distance if market conditions stabilize. His outlook underscores a shift from earlier optimism, as even bullish analysts now weigh the risks of overextended AI spending against macroeconomic headwinds.
Other financial institutions have echoed similar concerns, with Citi analysts warning that continued equity sell-offs, combined with higher interest rates and elevated energy prices, could undermine consumer spending and slow job growth. These factors are seen as potential downside risks to the broader economic expansion that has been partly fueled by tech-led investment.
Systemic Credit Risks From a Prolonged Tech Sell‑Off
The bond market that underpins many AI data‑center projects is already feeling pressure. Investors have begun off‑loading the debt issued to fund these facilities because they doubt that AI‑related revenue streams will be enough to service the “massive sums” borrowed for construction. If the sell‑off persists, issuers may face tighter financing conditions, raising the likelihood of defaults that could ripple through the broader credit market where banks, pension funds and hedge funds hold sizable positions.
Because equity exchanges serve as the primary venue for price discovery and liquidity, a sharp decline in tech stocks can strain the ability of markets to absorb large sell orders. With the global stock market capitalization now exceeding $111 trillion, a sustained pull‑back from the technology sector—once a major driver of market gains—could reduce overall market depth, making price swings more pronounced and increasing volatility across asset classes.
Moreover, many large institutional investors participate in both equity and fixed‑income markets. A coordinated retreat from AI‑linked equities and the associated bonds could compress spreads, force a reallocation of capital away from growth‑oriented assets, and amplify funding pressures for other sectors that rely on similar financing structures.
Anthropic’s Revenue Slowdown and AI Investment Scrutiny
Quarterly revenue growth at Anthropic has slowed, according to a Financial Times report cited in the NBC News article. Despite the company’s profitability and a valuation projected to exceed $1 trillion upon going public, its current revenue of nearly $17 billion has not translated into sustained growth momentum. This slowdown has intensified investor scrutiny over whether the massive capital influx into AI infrastructure can deliver proportional returns.
The article notes that nearly half of all U.S. economic growth this year is tied to tech-related spending, much of which has been directed toward AI ventures like Anthropic. As revenue growth decelerates at prominent AI firms, concerns mount that the wealth effect driving consumer spending and job market stability could weaken if AI investments fail to meet expectations.
Global Market Context and Historical Trends
The total market capitalization of all publicly traded stocks worldwide reached $111 trillion by the end of 2023, up from $2.5 trillion in 1980, reflecting decades of growth in equity markets. As of January 2022, the United States accounted for about 59.9% of global stock market value, making it the largest national market by far, followed by Japan at 6.2% and the United Kingdom at 3.9%. This dominance means that shifts in U.S. equities, particularly in technology stocks, have a disproportionate impact on global market dynamics and investor sentiment worldwide.
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Photo: Carol M. Highsmith (Public domain)
