Published online by Cambridge University Press: 24 May 2022
We examine, conditional on structural shocks, the macroeconomic performance of different countercyclical capital buffer (CCyB) rules in small open economy estimated medium-scale Dynamic Stochastic General Equilibrium (DSGE) model. We find that rules based on the credit gap create a trade-off between the stabilization of fluctuations originating in the housing market and fluctuations caused by foreign demand shocks. The trade-off disappears if the regulator responds to house prices instead. It turns out that the welfare-maximising simple CCyB rule implies responding to house prices only and not to the credit gap. Such rule also leads to significant welfare gains compared to the no CCyB case.
The views expressed here are those of the authors and do not necessarily reflect the views of the Central Bank of Ireland, the ECB, the National Bank of Belgium, or of the Eurosystem. We thank participants at the ECB’s Working Group for Econometric Modelling, OMRTF team, 2016 EEA, INFINITI, IMFS conferences, 2017 IFC-NBB conference, 2017 CBMM workshop, MMCI Research Conference, 2018 CEBRA Annual Meeting, and Daragh Clancy, Martin O’Brien, Gabriel Fagan, Reamonn Lydon, Gerard O’Reilly, and Luca Zavalloni for helpful comments. Most of the analysis was conducted while the authors were working at the Central Bank of Ireland.