They identified four critical errors, including raising interest rates in 1931 to defend the gold standard and failing to act as a "lender of last resort" to stop banking panics.
The work served as the foundation for , emphasizing stable monetary rules over discretionary government management. It has had a lasting impact on central banking; former Fed Chairman Ben Bernanke famously conceded to the authors on behalf of the Federal Reserve: "You're right, we did it. We're very sorry. But thanks to you, we won't do it again". A Monetary History of the United States, 1867-1960
Before this book, the prevailing Keynesian consensus held that monetary policy was largely ineffective, especially during deep downturns. Friedman and Schwartz challenged this by demonstrating that: They identified four critical errors