美股反弹速度真快啊 While the universe threw plenty of unpleasant surprises at investors this year -- the meme frenzy, the delta strain of the coronavirus, inflation anxiety and geopolitical constraints -- the S&P 500 has climbed the wall of worry without looking down. The average time it took the equity index, or its predecessors, to recover from a two-standard deviation decline this year has plunged to 2.6 days, the lowest in data going back to 1928