SP500 index may have completed its wave B ( Red Circled) of its expanding flat pattern ABC (Red Circled). Where price have formed a Doji candle on 26 Oct 2021 @ 2 red upper trend line (Red Dotted).. Price could have about 9.89 % drop from current price of around 4550 toward around 4100 which are 1) Next Major Demand Zone ...2) Lower Parallel Line Support (Red) 3)Daily 233 EMA (white) support. Stop Lost for the short would be at 4590