After US stock market were down for the two days, there are theoretical explanations and possibly blamable invisible big institution, namely Soft Bank.
Rising Delta (Root, 2020, September 1;Root, 2020, September 4 ) was one of explanation that the unusual stock market rally in this unusual circumstance when economic activities are still low, though recovering from entire shot down; while SoftBank might have caused Delta to rise unusually fast (Levisohn, 2020, September 4;McDonald, 2020, September 1). Most investors and traders may have been licking their sour wounds due to stock market down last two days wondering what just happened. Knowing why might be a good start of 12 steps of addiction break therapy, if greed-driven trading is one of mental addiction.
Rachel Kim (2020, September 6). Following a Big Rally and Sober Look, The Blue Ocean Management.com, Retrieved from: https://theblueoceanmanagement.com/2020/09/06/us-stock-market-down/
Levisohn, 2020, September 4, Barrons.com
McDonald, 2020, September 1, The Bear Traps Report
Root, 2020, September 1, Barrons.com
Root, 2020, September 4, Barrons.com