$SPX500 今日下跌1.6% — 是什么原因？

It looks like a fairly standard pullback given recent gains. Nothing seems to be definitively driving it beyond general market consolidation. I'm not positioned for this kind of intraday volatility.

Wow, that's a pretty big drop today. I'm still trying to understand what factors cause such sharp movements in the SPX500. Is there a specific news event or economic report that might be influencing this?