This paper investigates the role of the monetary aggregates after dere
gulation as well as an alternative credit view of the monetary transmi
ssion mechanism. The credit view, based on the assumptions that not al
l financial assets are perfect substitutes and not all agents are iden
tical, suggests that the spread between the commercial paper and Treas
ury bill rates may serve as an indicator of monetary policy. Other int
erest rate spreads which might be useful are a term-structure spread a
nd a private-public risk spread. Johansen's multivariate tests for coi
ntegration are used to determine whether a set of variables including
the federal funds rate, an indicator variable, a monetary aggregate, o
utput and the price level are linked in a single cointegration relatio
nship. Empirical results strongly support the hypothesis of cointegrat
ion when M1 is included as an intermediate target. The commercial pape
r-Treasury bill and term structure spreads serve as monetary policy in
dicators, but the private-public risk spread responds to changes in ou
tput rather than serving as an indicator.