"Stock indices, such as $SPX tends to be mean reverting"

Clarifying

1 in a strongly uptrend market, mean-reverting to 50d SMA

2 in a slightly up or sideway market, mean-reverting to 100d SMA

3 in a mild bear market, mean reverting to 200d SMA

It became self-fulling prophecy https://t.co/J8eFKavpS5