The Great Depression in the United States was caused - I won't say caused, was enormously intensified and made far worse than it would have been by bad monetary policy.
Milton FriedmanThe stock market crashed in October 1929. But that was not the cause of what caused the Great Depression. It was, in my opinion, a very minor element of it. What happened was that from 1929 to 1933 you had a major contraction which, in my opinion, was caused primarily by the failure of the Federal Reserve System, to follow the course of action for which it was set up. It was set up to prevent exactly what happened from 1929 to 1933. But instead of preventing it, they facilitated it.
Milton FriedmanIf even a small fraction of the money we now spend on trying to enforce drug prohibition were devoted to treatment and drug rehabilitation, in an atmosphere of compassion not punishment, the reduction in drug usage and in the harm done to users could be dramatic.
Milton Friedman