2025-04-04 | 上周末 ( Trump trade war 2.0 ): SPY的均方差為-3 Delta. Vol: 217M shares
2022-06-16 ( FED increase interest rate ): -2.5 Delta. Vol: 170M shares
2020-03-16 ~ 2020-03-23 ( COVID ): -9 Delta. Vol: 347M shares
2018-12-24 ( US-China trade war ): -3 Delta Vol: 255M shares
2011-8-10 ( Euro debt crisis ): -5 Delta Vol: 717M shares
2009-3-2 ( Bottom of 2008 financial crisis ): -4.5 Delta Vol: 490M shares
2008-10-10 ( Lehman bankrupt ) : -8 Delta Vol: 871M shares
2008-1-24 ( Bears Stern ) : -3.5 Delta Vol: 511M shares
2003-2-12 ( Bottom of 2001 stock crash ): -3.0 Delta Vol: 59M Shares
