S&P 500 (SPY) CAPE Ratio Climbs Over 40, Signaling Market Risks

The S&P 500's cyclically adjusted price-to-earnings (CAPE) ratio has increased more than 12 points since the start of 2023, now exceeding 40, a level last observed before the dotcom bubble. According to Capital Economics, this suggests the market may be entering a speculative phase of the AI-driven rally. Valuation expansion is attributed to over two-thirds of the S&P 500's recent gains, with a forward 12-month P/E ratio currently around 21, below 24 during the dotcom era. Concerns persist about the sustainability of earnings growth, raising questions about future valuations.