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This paper examines the interaction between monetary and budgetary policy. A comparison of the dynamic responses in different exchange rate regimes offers an assessment of the monetary union case. The analysis proceeds on an SVAR-common trends model. In its current specification, we can only infer responses to the budgetary policy shock. Its identification is obtained by imposing a (long term) solvency condition on government accounts, exploiting automatic stabilisation responses of government revenues, and the imposition of the Fisher relationship. Two main conclusions emerge. Budgetary policy shocks indirectly lead to monetary tightening. Such effects are significant in countries with flexible exchange rate regimes only. Second, policy regime shifts are important.