Overview
- The S&P 500 has set multiple record highs in August and is more than 12% higher year-to-date, creating a common decision point for cash holders.
- J.P. Morgan's long-run analysis since 1970 shows slightly higher average returns when buying at all-time highs: about 9.4% over one year and 20.2% over two years versus 9% and 18.5% on non-high days.
- Valuation measures such as the Shiller CAPE are near levels seen only at the dot‑com peak, which historically signals elevated downside risk if sentiment shifts.
- Near-term triggers that could produce sharp volatility include higher interest rates, geopolitical developments, and unusually high market expectations for AI-driven gains.
- Waiting for a pullback requires two correct calls — predicting a larger drop and timing the re-entry — so investors face the tradeoff of possibly missing further gains or risking a costly early purchase.