We test the hypothesis that the Great Contraction would have been atte
nuated had the Federal Reserve not allowed the money stock to decline.
We simulate a model that estimates separate relations for output and
the price level and assumes that output and price dynamics are not esp
ecially sensitive to policy changes. The simulations include a strong
and a weak form of Friedman's constant money growth rule. The results
support the hypothesis that the Great Contraction would have been miti
gated and shortened had the Federal Reserve followed a constant money
growth rule.