2018年10月美股跌破2016年来的上升趋势，12月下旬，加速下跌，跌幅达到-20%，触及熊市临界领域。见下图：
下面是几个主要股指的跌幅：
|
index
|
3 years Risk (as of Jan 31,2019)
|
correction
|
|
spx
|
11.14%
|
-20.21%
|
|
indu
|
11.38%
|
-19.63%
|
|
compq
|
15.00%
|
-23.89%
|
|
NYA
|
16.11%
|
-19.14%
|
|
Rut
|
16.11%
|
-27.28%
|
|
tsx
|
9.12%
|
-16.94%
|
|
dax
|
14.84%
|
-22.15%
|
|
JIM
|
6.54%
|
-9.1%
|
|
