A Rally That Fuels the Economy—And Its Risks

The U.S. stock market, long hailed as a barometer of economic optimism, may now represent one of America’s most significant vulnerabilities. Roughly $9 trillion in equity gains over the past year have fueled a wave of consumer spending among affluent households. But economists warn that the same force propelling growth could reverse rapidly if valuations falter.

Mark Zandi, chief economist at Moody’s Analytics, cautioned that the economy’s resilience increasingly hinges on market momentum. “The surge in stock prices is so key to the well-to-do who are driving consumer spending,” he told Yahoo Finance. “If that gets turned into reverse and we see stock prices decline, that’s the real threat to the economy.”

Zandi’s comments come as U.S. equities rebounded Friday after President Trump signaled a pause in trade escalation with China. Yet behind the market’s relief rally lies a deeper fragility — a dependence on asset-driven consumption at a time when inflation, tariffs, and private credit risks still loom large.

Wealth Concentration and Market Dependence

According to Moody’s estimates, the top 10% of U.S. earners account for about half of all consumer spending, meaning much of America’s growth now rests on a narrow segment of the population. When portfolios climb, so does discretionary spending — luxury travel, retail purchases, and high-end services all benefit. But when markets slide, that consumption can freeze overnight.

Zandi described valuations as “juiced, overvalued, bordering on frothy,” warning that even a modest correction could ripple through the broader economy. The pattern mirrors the late 1990s dot-com boom, when paper wealth evaporated faster than spending patterns could adjust, amplifying recessionary shocks.

This dependence creates a feedback loop: rising stock prices sustain economic confidence, while declines threaten to reverse it. The wealthy, confident in their portfolio gains, continue spending, while middle- and lower-income households—already stretched—see fewer benefits and face tightening budgets.

A Divided Consumer Landscape

Deborah Weinswig, CEO of Coresight Research, called it a “bifurcation of the consumer.” While higher-income Americans remain robust spenders, lower-income households are visiting more stores and stretching budgets to find value. The retail landscape reflects this divide: discount giants like Walmart and TJX Companies are thriving alongside luxury brands, while mid-tier retailers struggle to maintain relevance.

Even affluent consumers are showing early signs of restraint. Deloitte’s 2025 holiday retail survey found overall spending expected to decline 10% from last year, with one in four households earning above $200,000 adopting “value-seeking behavior.”

This cautious sentiment extends beyond retail. At Semafor’s World Economy Summit, Goldman Sachs president John Waldron warned that rising economic polarization could become destabilizing. “Those on the lower end of the economy are suffering,” he said, pointing to bankruptcies in the auto sector and mounting household debt as indicators of deeper strain.

What Lies Ahead

If markets continue climbing, America’s consumption engine may stay intact. But the risk is asymmetrical: a sharp market correction could expose the fragility beneath the surface of the U.S. economy. Policymakers and investors alike are now watching whether the stock-driven wealth effect can endure amid geopolitical tensions, persistent inflation, and slowing global demand.

In the months ahead, the resilience of the U.S. consumer—and by extension, the broader economy—may depend less on the next jobs report or tariff negotiation and more on whether Wall Street’s rally can sustain Main Street’s optimism.