When Markets Defy Gravity

Why expensive stocks aren't a sell signal—and what history teaches about valuation warnings

The Fed chair recently described U.S. stocks as “fairly highly valued.” That phrase sounds harmless, but history says otherwise. We’ve heard this tone before. In the late 1990s, Alan Greenspan called markets “irrationally exuberant.” He wasn’t wrong—but acting too early cost investors more than ignoring him altogether.

Fast forward to 2025. By headlines alone, this should’ve been a terrible year for stocks: tariffs, inflation anxiety, political noise, credit downgrades. Yet U.S. equities pulled off a sharp comeback. By late September, the S&P 500 was up nearly 14%, the Nasdaq over 17%. On the surface, everything looks fine.

Dig underneath, and the story changes. Market performance has been wildly uneven. Technology and communication services—carried largely by Alphabet and Meta—did the heavy lifting. Defensive sectors like healthcare, consumer staples, real estate, and energy went nowhere. This wasn’t a broad-based rally. It was a concentrated one.

Then there’s the elephant in the room: the “Magnificent Seven.” Apple, Nvidia, Microsoft, Alphabet, Amazon, Meta, and Tesla continue to dominate market value. Despite a rough first quarter, they rebounded hard and now account for over half of total market gains in 2025. If you’re betting on a market collapse without these names cracking first, you’re betting against the data.

Interestingly, smaller-cap stocks quietly outperformed large caps this year, mostly in the third quarter. Value stocks showed brief life early on, then faded again. Momentum— stocks that were already winning — regained control. Same movie, new act.

What didn’t move much? Interest rates. Despite tariff shocks and a U.S. credit downgrade, Treasury yields barely budged. Corporate credit spreads spiked briefly, then settled. The bond market, usually the nervous one, stayed calm. That alone explains why stocks didn’t panic.

Globally, non-U.S. markets actually outperformed the S&P 500 in 2025, helped by a weaker dollar. Europe, China, Latin America—all did better. India, notably, lagged badly, likely correcting after entering the year as one of the most expensive markets worldwide.

So, are U.S. stocks overpriced? By almost every metric, yes. Prices are high relative to history. Price-to-earnings ratios are stretched. Earnings yields barely beat Treasury yields. Even when you account for growth using intrinsic value models, stocks still look about 10–15% above fair value. That doesn’t scream “bubble,” but it does whisper “fragile.”

Here’s the catch: overvaluation is not a timing signal.

Every sensible market-timing strategy—whether based on CAPE ratios, earnings yields, or valuation bands—fails once you test it honestly. Not sometimes. Consistently. After taxes and trading costs, doing nothing beats clever timing more often than not. Even during the dot-com era, selling early hurt more than staying invested through the crash.

So what should investors actually do?

First, don’t panic-sell. Valuation alone won’t save you from bad timing.

Second, if you’re uneasy, slow down new investments instead of blowing up your portfolio. Let cash build naturally.

Third, rebalance with discipline, not emotion. Adjust exposure based on risk tolerance, not headlines.

Fourth, forget protection trades unless you know exactly what they cost and when they pay off—they’re expensive and unforgiving.

Finally, if you insist on timing the market, write your rules down, test them brutally, and accept the results without excuses.

Markets can stay expensive longer than your patience—and longer than your confidence.

Takeaway: Being right about valuation is easy; making money from it is the hard part.