A key gauge of stock market valuation used by the Federal Reserve has fallen to its lowest level in two decades, suggesting investors are receiving the slimmest compensation for taking on equity risk since the dot-com era.
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This 1 key metric is flashing a 20-year warning sign
A key measure of stock market allure has slumped to a 20-year low, signaling that equities offer the thinnest risk-adjusted advantage over government bonds since before the 2008 financial crisis. The equity risk premium, or ERP, now stands at 2.7 percent, according to the Federal Reserve’s May 2026 Financial Stability Report, a level that some analysts see as a warning sign for a market priced for perfection.
"I actually believe that what we’re seeing is more about incredible euphoria or optimism than it is the extinction of the risk premium," said Brad Conger, chief investment officer at Hirtle & Co., which oversees $29 billion. "People can be so excited about growth that they make bad assumptions."
The premium is calculated by taking the S&P 500's forward earnings yield, recently 4.7 percent, and subtracting the real 10-year Treasury yield, recently near 2 percent. The resulting 2.7 percent spread is substantially below the median of 4.6 percent recorded in Fed data since 1991 and is approaching the negative levels seen during the dot-com bubble of the late 1990s.
At stake is whether future earnings growth can justify such a compressed premium. With safe government bonds offering a guaranteed 2 percent real return, investors are being offered only a meager 2.7 percent extra to stomach the volatility of the stock market. This low premium could trigger a capital shift from equities to bonds, particularly if high expectations for artificial intelligence-related profit growth begin to falter.
An Optimism Premium, or a Valuation Problem?
The debate centers on the cause of the shrinking premium. Bulls argue that explosive earnings growth, driven by massive investment in artificial intelligence, has fundamentally increased the attractiveness of stocks, justifying a lower risk premium. From this perspective, the market is simply and correctly pricing in a new era of productivity and profitability, making comparisons to past decades less relevant.
However, some investment managers see a classic late-cycle signal. Conger warns of a risk that the AI buildout proves excessive, similar to the overinvestment in fiber-optic cable during the 1990s tech bubble. "That’s what really kills an economy, when you’ve malinvested a trillion dollars and somebody here, being the debtholders, has to eat it," he said.
This view suggests the low ERP is not a sign of falling risk, but of investors ignoring it. Should AI-driven growth slow or the cost of capital remain elevated, a market with such a thin risk cushion could be vulnerable to a sharp correction. In response, Conger recommends that investors trim technology holdings, rebalance portfolios with more bonds, and increase exposure to European markets.
This article is for informational purposes only and does not constitute investment advice.
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