The close correlation between the monetary aggregates and many measure
s of economic activity appear to have broken down during the 1980s. In
deed, most simple correlations between the M1 definition of money and
inflation are of opposite signs during the 1980s from those of the 196
0-1979 time period. However, if the determinants of money demand, wide
ly discussed during the 1950s, are taken into account, then the money
to economic activity relationship remains very strong and significant
during the 1980s. In this regard, monetary policy seems to have become
significantly more contracyclical in recent years, and this accounts
for much of the different simple correlations in the 1980s from the ea
rlier post-World War II periods.