David Rosenberg argues that U.S. equities are in a valuation mania, with investor behavior—not technology itself—forming the bubble. He says the economy is being held up by AI-related capex, equity wealth effects, and fiscal support, but sees weak underlying labor conditions, fading inflation pressures, and lower forward return prospects for U.S. stocks.
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This is an interview with David Rosenberg, founder and president of Rosenberg Research, on Excess Returns. He opens by explaining his career-long framework: identify where consensus is wrong, assign probabilities to multiple scenarios, and focus on left-tail risk without becoming a simple perma-bear. He says his reputation was shaped by starting his career on Black Monday in 1987 and by repeatedly warning about housing and other excesses before they became obvious. The core market thesis is that the U.S. stock market is in a bubble or mania, but the bubble is in investor behavior and valuation, not in the underlying technology theme. He argues that generative AI is real, similar to the internet, railroads, or electricity, but the market has priced it as if it were riskless. …
Tactically, U.S. equities look crowded and vulnerable because the market is priced for strong earnings, easy policy, and continued AI-fueled momentum all at once. Near-term upside may persist, but the risk/reward favors caution rather than chasing strength.
Over the next few quarters, the key question is whether AI spending and fiscal support keep offsetting soft labor and fading savings effects. My read is that growth likely disappoints relative to what is priced in, which should pressure multiples even without a clean recession.
Structurally, this is a regime where the U.S. stock market has become a major macro transmission mechanism and where expensive risk assets can distort the real economy. If valuations mean-revert, the lasting implication is lower real returns for U.S. equities and a stronger case for global diversification and hard assets.
Investor behavior, not AI technology itself, is the bubble.
He says the technology is real, but the bubble is in how investors price it as if it were riskless.
The U.S. equity market is one of the most expensive in recorded history and expected returns from here are poor.
He cites CAPE around 40 and says nominal returns over 1, 3, 5, and 10 years look close to zero or negative.
The stock market now drives the economy more than the housing market does.
He argues households watch portfolios constantly and spend more when their equity wealth rises.
How would you describe your role as a cycle watcher and navigator?
Rosenberg says his job is to identify when the market or business cycle differs from consensus and explain the trade. He frames his work as spotting where the cycle is, early/mid/late, and helping investors stay out of trouble by identifying tail risk.
Do you focus more on left-tail risk because of your start in the 1987 crash, or do you think about all tail risks equally?
He says the issue is really which tail is fatter or thinner, and that his experience taught him how institutional investors think in probabilities. He explains that his work now centers on constructing forecasts with a base case plus alternate scenarios, because investors need plan A, B, C, D, or E.
What did you learn from being told to stop using the phrase housing bubble?
He says that episode showed him the sell-side economist largely functions as a marketing tool with limited independence. It also reinforced for him that firms often care more about internal discomfort and deal flow than saying uncomfortable truths.
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