In this paper, we try to illustrate the interest of the Bayesian approach for the evaluation of economic policies, often realised by analysing the response of the economy to a standard shock. We present a Stochastic Dynamic General Equilibrium model for the euro area. The Bayesian estimation gives a measure of the uncertainty on the parameters, from which we can derive the uncertainty of the responses to standard shocks. As an illustration, we simulate the effects of a fiscal shock (announced VAT increase).DSGE, Euro zone, Nominal rigidities, Bayesian estimation.
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