When Abby Joseph Cohen talks about market risk, people tend to listen. The former chief US investment strategist at Goldman Sachs, now a professor at Columbia Business School, is flagging something that should make equity investors uncomfortable: stock valuations are so stretched that even minor disappointments could trigger outsized pain.

Cohen’s core argument is straightforward. US stock valuations are “fully priced,” and that leaves investors with “no cushion for error,” particularly when it comes to labor market data. In a market where everything has to go right to justify current prices, the labor market is one of the things that might not.

The labor market problem hiding in plain sight

Cohen’s concern is that softening labor conditions could catch equity investors off guard, precisely because current valuations assume continued earnings growth that a weakening job market would undermine. Weaker employment leads to reduced consumer spending, which hits corporate revenues. Companies that miss earnings expectations in a market priced for perfection don’t get a gentle correction. They get punished.

AI stocks and the dollar: two more pressure points

Cohen’s caution extends beyond the labor market. In her January 2026 commentary, she pointed to a potential deceleration in AI-related stock growth, a sector that has been one of the primary engines driving equity indices higher over the past two years.

Cohen also highlighted the impact of a weaker dollar, which creates a kind of double bind for investors. A declining dollar makes imports more expensive, feeding into inflationary pressures. Higher inflation, in turn, constrains the Federal Reserve’s ability to cut interest rates, or worse, forces the central bank to keep rates elevated longer than markets currently expect.

Who is Abby Joseph Cohen, and why does her opinion matter?

Cohen built her reputation over decades at Goldman Sachs, where she served as the firm’s chief US investment strategist before retiring in 2021. She became one of Wall Street’s most prominent voices during the 1990s bull market, correctly identifying the long-term upward trajectory of US equities at a time when many were skeptical.

Cohen maintains a long-term bullish outlook on US equities even now. Her concern isn’t that stocks are doomed. It’s that the margin of safety has evaporated. Her current role at Columbia Business School also gives her a degree of independence that active Wall Street strategists don’t always enjoy.

What this means for investors

For investors heavily allocated to US equities, particularly in technology and AI-adjacent sectors, the message is one of valuation discipline. Employment data releases could become significant catalysts for volatility in a way they haven’t been during periods of more moderate valuations. The weaker dollar dynamic adds another layer of complexity, as domestically focused companies could face margin pressure from rising import costs.