The S&P 500 is poised for a final rally to 8,000 in 2026 before a 13% correction to 7,000 in 2027, according to Capital Economics. The research firm warns that stretched tech valuations and slowing earnings growth will trigger a market reversal as investors reassess AI-driven stock prices.

While the index could climb higher, analysts caution that tech sector valuations have reached levels not seen since the dot-com bubble. The price-to-forward earnings ratio for US tech stocks briefly hit its highest point since 2000 last year. Capital Economics suggests that AI enthusiasm may push valuations beyond sustainable levels, creating vulnerabilities even as corporate earnings remain strong.

Additional risks include potential economic slowdown, competition from China's AI sector, and geopolitical tensions affecting European markets where US tech firms generate about 40% of revenue. The firm also notes concerns about AI capital expenditures and whether the technology will deliver on investor expectations. Despite these headwinds, Capital Economics maintains that AI will ultimately benefit the real economy, suggesting the coming correction represents a market reassessment rather than a fundamental shift in technology's long-term prospects.