SPY ... A bearish Megaphone pattern may be "in play"

.... using Price Action ... the SPY 296 area is the recent pivot low candle prior to a newer high candle.... a close below this area violates support and would suggest more lows are to follow. This is the area to watch closely and it would be a conservative location for a short position, with a stoploss slightly above the recent high.
Elliott WaveTrend Analysis

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