An inventory-theoretic approach suggests that deposit rate deregulatio
n will increase the interest-elasticity of the demand for money if dep
osit rates adjust to changes in market rates with a lag. This hypothes
is is tested using a short-run nominal adjustment specification for M1
, MIA and M2. Sector data is also used to provide independent tests ba
sed on the impact of deregulation on each sector. Empirical results ca
nnot reject the hypothesis that deposit rate deregulation has increase
d the interest-elasticity of M1, MIA and M2 while business sector dema
nd deposits have been unaffected. Deregulation has loosened the relati
onship between the monetary aggregates and income, making it more diff
icult to evaluate the impact of a target on macroeconomic goals.