U.S. Economic Growth Increasingly Driven by Wealthiest Households, Raising Concerns Over Sustainability

Recent economic analysis indicates that the U.S. economy’s growth is becoming increasingly dependent on the country’s wealthiest households, with personal spending patterns diverging sharply along income lines. Moody’s chief economist Mark Zandi has highlighted that the top 20% of American consumers now account for 60% of all personal outlays, a substantial increase from the roughly 50% share observed during the late 1990s internet bubble period.

Zandi notes that in the year ending the first quarter of 2026, households earning $200,000 or more annually saw their spending rise by 6.5%, or 4% after accounting for inflation. By contrast, real spending growth for the bottom 80% of households was essentially flat over the same period. This divergence has persisted since the COVID-19 pandemic, with Moody’s analysis of Federal Reserve data showing that the bottom 80% have increased their spending by 4.5% since the pandemic, only marginally outpacing inflation, which stood at 3.9%. In comparison, the top 20% increased their spending by 8.3% over the same timeframe.

This trend, Zandi explains, helps clarify why many Americans express dissatisfaction with their personal financial situations and the broader economic outlook, despite positive macroeconomic indicators. Unemployment has remained relatively steady, and the U.S. gross domestic product grew at an annual rate of 2.1% in the first quarter of 2026. Nevertheless, affordability remains a central issue in political discourse, particularly as midterm elections approach, with voters expressing concerns about the cost of living and demanding relief.

Zandi characterizes the current U.S. economic landscape as a 'K-shaped economy,' where wealthier households continue to thrive while the majority experience stagnation. He indicates there is no evidence to suggest this trend will reverse in the near term. Underlying this dynamic is the 'wealth effect,' a phenomenon in which increases in household wealth boost consumers’ willingness and capacity to spend, particularly when those gains are realized through capital appreciation in assets such as stocks.

According to Federal Reserve distributional accounts cited by Zandi, nearly 90% of corporate equities and mutual funds are held by households in the top quintile of the income distribution. The concentration of financial assets among the wealthiest Americans has become more pronounced in recent years, further intensifying the economy’s reliance on this group’s spending activity.

Zandi draws a parallel to the late 1990s, noting that a similar reliance on affluent consumers was observed then, when surging equity valuations inflated household wealth and spending. He cautions, however, that current market conditions exhibit signs of overvaluation. Price-to-earnings multiples, a key measure of stock market valuation, are now at a level of 19 times earnings—a threshold Zandi describes as 'sending up yellow, if not red, flares.' He stops short of calling the current environment a full-fledged market bubble, but states that warning signs are accumulating.

One area of particular focus is the impact of artificial intelligence (AI) on stock valuations. Zandi acknowledges that AI-related stocks have appreciated for both fundamental reasons—given AI’s potential as a transformative technology—and because passive index funds are required to purchase these stocks as their weights within indices grow. This dynamic has amplified the rise in equity values, which in turn disproportionately benefits the wealthiest households with significant market exposure.

Zandi’s analysis suggests that the apparent resilience in consumer spending is less secure than headline figures might indicate. Should stock market valuations falter, the resulting decline in wealth could induce caution among high-income consumers, with potential negative effects on the broader economy. He posits that if current trends persist, wealthy consumers will continue to support economic growth; however, a downturn in equities could trigger a broader slowdown.

The economic implications of this concentration of spending are significant for both policymakers and market participants. The degree to which the overall economy is tethered to asset prices raises concerns about stability and the potential for volatility. Zandi’s perspective is that while there are solid fundamentals driving parts of the rally—particularly in AI—there are also elements of speculation and forced buying by index funds that could heighten market risk.

In summary, the latest data and analysis indicate that the U.S. economic expansion is increasingly underpinned by a narrow segment of affluent households whose fortunes are closely linked to the performance of financial markets. While this has contributed to continued overall growth, it also introduces vulnerabilities, especially if asset prices reverse. The ongoing divergence in financial well-being between the top 20% and the rest of the population is a central factor shaping both economic outcomes and public sentiment.