I was [initially] convinced by Friedman and Schwartz that the 1929-33 down turn was induced by monetary factors…
I concluded that a good starting point for theory would be the working hypothesis that all depressions are mainly monetary in origin. Ed Prescott was sceptical about this strategy from the beginning…
I now believe that the evidence on post-war recessions (up to but not including the one we are now in) overwhelmingly supports the dominant importance of real shocks.
But I remain convinced of the importance of financial shocks in the 1930s and the years after 2008. Of course, this means I have to renounce the view that business cycles are all alike!
Utopia, you are standing in it! 
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