Morgan Stanley’s strategists are sounding the alarm: the stock market’s recent run-up has left equities vulnerable to a potentially large decline, driven by a global bond selloff that shows no signs of letting up.
Rising bond yields compress stock valuations, and right now, those valuations don’t have much room to compress before things get ugly.
The bond-stock feedback loop
Morgan Stanley has flagged instances of simultaneous declines in stocks and bonds, particularly when growth and inflation trends align in ways that punish both sides of the ledger, weakening the 60/40 portfolio strategy where 60% of holdings sit in equities and 40% in fixed income.
The firm points to a specific dynamic that unfolded earlier this year. A duration rally in February, where longer-dated bonds gained value as investors bet on falling rates, completely reversed course in March. US 10-year breakevens, a market-based measure of expected inflation over the next decade, climbed to 2.31%. Yields broke out of their recent trading ranges.
When yields rise at the long end of the curve, it tightens financial conditions across the entire economy. Borrowing gets more expensive. Corporate debt refinancing costs climb. And the discount rate used to value future corporate earnings goes up, which mechanically pushes stock prices down.
Valuations running on fumes
Morgan Stanley’s central concern is that the US equity rally has pushed valuations to levels that leave almost no margin for error. The equity risk premium, which measures the extra return investors receive for holding stocks over safer government bonds, has fallen to very low levels.
Morgan Stanley highlights several unresolved macro risks that could serve as catalysts: persistent inflation that refuses to cooperate with central bank targets, policy repricing as markets adjust expectations for rate cuts, liquidity stress in funding markets, and geopolitical tensions that could disrupt trade or energy supplies.
The strategists also note that earnings need to improve substantially to justify current price levels. Without meaningful earnings growth, the gap between what investors are paying for stocks and what those stocks actually generate in profits becomes increasingly difficult to sustain.
Liquidity is the wildcard
Morgan Stanley identifies liquidity stress as a key factor that could amplify any selloff, coinciding with already-stretched valuations. The firm suggests that if conditions deteriorate enough, intervention from the Federal Reserve or the US Treasury might become necessary to stabilize markets.
The rising inflation expectations embedded in bond prices complicate any potential policy response. The Fed cannot easily cut rates or expand its balance sheet to support markets if doing so risks further stoking inflation.
What this means for investors
Morgan Stanley’s analysis suggests that the risk-reward profile for equities has shifted meaningfully. The compressed equity risk premium means the market is priced for a best-case scenario. The key variable to watch is whether the 10-year yield continues breaking higher or stabilizes. If breakevens keep climbing above that 2.31% level, it signals that inflation expectations are becoming unanchored from the Fed’s target, which would put additional pressure on both stocks and the central bank’s credibility.
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