The FRED® Blog
What’s behind the recent surge in the M1 money supply?
https://fredblog.stlouisfed.org/2021/01/whats-behind-the-rec...
Definitely a good factor to know about, but there's also been a huge surge in things like Monetary Base (currency in circulation+reserves) [0]. Looks to me like there's a lot of (effectively) money printing behind this, not just an artifact of M1's definition?