If Interest Rates Go Negative ....

Cash Havens With $4.8 Trillion Fret Unthinkable Negative Returns

https://www.bloomberg.com/news/articles/2020-05-08/cash-havens-with-4-8-trillion-fret-unthinkable-negative-returns 

Some traders bet the Fed will push interest rates negative next year

https://www.marketwatch.com/story/some-traders-are-betting-the-fed-will-push-interest-rates-negative-next-year-2020-05-07