This paper examines postwar U.S. data and tests tile implications of B
all and Mankiw's (1994) model of asymmetric price adjustment that mone
tary shocks have asymmetric effects on output and that the degree of a
symmetry is positively related to movements in average inflation. The
empirical analysis extends Cover's (1992) framework to allow the degre
e of assymetry to depend on an expected inflation series generated fro
m Hamilton's (1989) Markov snitching model. The results indicate that
monetary shocks display asymmetric effects which are exacerbated by in
creases in average inflation and that negative monetary shocks have a
larger absolute impact on output.