Using a recently developed time-series approach, we show that post-WWII US inflation became highly persistent during the 'Great Inflation' period, and then switched back to a low persistence process during 1984, and has remained stationary until the present day.

McCallum (2010) presented evidence that the spurious regression problem can be solved by standard means. We show using finite-sample evidence that the spurious regression problem cannot always be fixed using standard autocorrelation correction procedures and remains, therefore, a not-so-spurious...