What happens to stocks and cryptocurrencies when the fed stops raining money?

This financial boom could be too good to be true. An unprecedented fiscal and monetary stimulus led by the Federal Reserve is fuelling a new investor euphoria. Here, Greg Ip explores what could happen when the government needs to tighten up the measures it took because of the pandemic. Will high-priced stocks earn the profits of their current valuation, or will they collapse under their own weight?