"Nobody Really Knows How the Economy Works. A Fed Paper Is the Latest Sign": https://www.nytimes.com/2021/10/01/upshot/inflation-economy-...
Greenspan: There was a "flaw in the model of how I perceived the world works.": https://www.propublica.org/article/greenspan-says-i-still-do...
"Greenspan Says I Still Dont Fully Understand What Happened": https://youtu.be/R5lZPWNFizQ