Goldman Sachs Questions Whether S&P 500 Earnings Have Become a Bubble

Goldman Sachs published analysis this week addressing a question increasingly asked by investors: whether S&P 500 earnings themselves have entered bubble territory, rather than just stock prices. The note arrives alongside separate data showing margin debt — money investors borrow against their portfolios to buy more stock — rose 2.6% in August, a pickup that some strategists read as a sign of increasing risk appetite, or leverage, in the market. The two data points reinforce each other. If earnings quality is genuinely stretched, then rising leverage means any disappointment could hit harder than in past cycles, because more of the buying was funded with borrowed money rather than cash. Goldman's framing treats this as an open question rather than a settled conclusion, distinguishing it from more alarmist takes on the market's valuation. What remains unresolved is which specific sectors or mega-cap names Goldman flags as most exposed, and whether the margin debt increase continues into September or proves to be a one-month blip.