Using Geweke's approach to Wiener-Granger causality, bidirectional cau
sation between money supply and nominal output were detected. Inflatio
n in Malaysia is essentially a monetary phenomenon. The empirical find
ings suggest that by controlling money supply, the central bank might
be able to successfully maintain price stability at producer's level b
ut not at consumer's level unless narrow money stock is being targeted
. Serious attempts by the central bank to tighten money supply could h
ave a strong feedback on real output and even instantaneous impact on
nominal output.