This paper surveys research on the welfare cost of inflation. New estimates
are provided, based on U.S. time series for 1900-94, interpreted in a vari
ety of ways. It is estimated that the gain from reducing the annual inflati
on rate from 10 percent to zero is equivalent to an increase in real income
of slightly less than one percent. Using aggregate evidence only, it may n
ot be possible to estimate reliably the gains from reducing inflation furth
er, to a rate consistent with zero nominal interest.