Goldman Sachs warns that slowing but positive economic growth historically leads to smaller, earnings-dependent gains for U.S. equities [1].

This shift is significant because it suggests that the broad momentum driving the S&P 500 may be waning, forcing investors to rely on individual company performance rather than a rising economic tide.

According to strategist Ben Snider, historical data indicates that when overall economic momentum moderates, corporate earnings become the primary driver of stock performance [1]. This transition typically results in more modest market gains [1]. Snider said, "Slowing growth historically limits stock market gains."

The firm also expressed concerns regarding the current nature of the market rally. Snider said the AI-driven stock rally is becoming "one big trade" [2]. This concentration of growth in a few sectors may leave the broader market vulnerable if the artificial intelligence trend fails to produce immediate, widespread earnings growth [2].

Data regarding recent quarterly performance highlights how a few major players can distort the perception of overall market health. Investment gains from Amazon and Alphabet inflated Q1 S&P 500 earnings growth from 16% to nearly 25% [3]. This discrepancy suggests that the perceived strength of the index may be driven by a small number of tech giants, rather than broad-based economic strength [3].

Goldman Sachs said that these factors could limit further upside for stocks in the coming months [1]. As the economy enters a period of slower growth, the firm expects a more fragmented market where only companies with strong, independent earnings growth will thrive [1].

"Slowing growth historically limits stock market gains."

The analysis suggests a transition from a 'macro-driven' market, where general economic growth lifts all boats, to an 'earnings-driven' market. If the U.S. economy continues to slow, the S&P 500's reliance on a handful of AI-centric stocks creates a concentration risk; any correction in the tech sector could disproportionately impact the broader index.