ETFs have crushed Wall Street’s go-to stock-market indicator

The S&P 500’s 200-day moving average, a long-trusted bear-market signal, has lost reliability due to overuse by investors as a market-timing tool. Wall Street analysts now debate whether breaking below this threshold—triggered last Thursday—should paradoxically be viewed as bullish, reversing its traditional interpretation. ETF proliferation has distorted the indicator’s effectiveness, as algorithmic trading and passive funds react predictably to technical levels, undermining its predictive power. Investors relying on this metric for decisions may face misaligned strategies, as its historical significance erodes under modern market dynamics and high-frequency trading pressures. Skepticism is warranted toward analysts’ claims of a bullish reversal, given the indicator’s compromised integrity from widespread adoption and automated trading behaviors.