Previous euro area money demand studies have used aggregated national time series data from the countries participating in the European Monetary Union (EMU). However, aggregation may be problematic because macroeconomic convergence processes have taken place in the countries of interest. Therefore, in this study, quarterly German data until 1998 are combined with data from the euro area from 1999 until 2002 and these series are used for fitting a small vector error correction model for the monetary sector of the EMU. A stable long-run money demand relation is found for the full sample period. Moreover, impulse responses do not change much when the sample period is extended by the EMU period provided the break in the extended data series is captured by a simple dummy variable. 1 The Maastricht criteria specify reference values for government deficit and debt, the inflation rate and the long-term interest rates. For instance, the deficit criterion is met when the government deficit does not exceed 3% of GDP, while the debt criterion is met when gross government debt is not exceeding 60% of GDP.