Fed Chairman Powell said on the morning of the 18th Beijing time that the US GDP in the second quarter may be "easy" to shrink by 20% -30%, and businesses and families may need more financial assistance in "3-6 months" Avoid bankruptcy; it and FOMC members believe that negative interest rates may not be an appropriate or useful policy for the United States, but the Fed ’s ammunition has not been exhausted and more measures can be taken if necessary.