Ask HN: Why is EWZ not a falling knife?

[cloudartisans]

This is a serious question, given what's going on in Brazil! I look at the following two data sources and am trying to understand what's going on behind the scenes. Thanks in advance!

https://coronavirus.jhu.edu/map.html

https://www.google.com/search?tbm=fin&q=NYSEARCA:+EWZ