The thing is if America was a closed system then yes we would see massive inflation right now and a collapse of the stock market. But as a member of global community where everyone is the world is seeing the same financial problems, America is seen as the safest bet. People in other countries are investing in American companies and the American dollar more than ever. This is the only reason the stock market has not tanked, because it is still seen a safe bastion for your money. However, once unemployement stimulus runs out, PPP loans run out of forgiveness, bankrupcies begin to occur on a massive scale, and taxes have to be raised to cover more spending we will see a further crash. YOu can't just have 36 million unemployed people (which will be 50 million once PPP forgiveness runs out) and expect everything to remain normal. A large part of those people will not have a job to return as every company will try to cut costs.