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This paper presents evidence for sources and channels of nonlinearities and instabilities of the new Keynesian Phillips curve (NKPC) for the euro area and all but four member states over the last two decades prior to the COVID-19 crisis. The approach rests upon misspecification testing using auxiliary regressions based on the standard open-economy hybrid NKPC. Using a large number of specifications, this approach allows to systematically, i. e., based on a literature review, disentangle the evidence for nonlinearities and instabilities of the NKPC according to sources and channels. For the euro area and most considered member states, there is substantial evidence for nonlinearities and instabilities. The relatively most important channels of nonlinearities and instabilities are similar across countries, whereas the relatively most important sources differ across countries. The results strongly indicate the need for considering nonlinear NKPC relationships in empirical analyses and also point towards potentially useful nonlinear specifications.

This paper summarises the economic analyses of the potential impact of Brexit on the United Kingdom, European Union (EU) and euro area performed by members of and contributors to the Brexit Task Force, a group reporting to the International Relations Committee of the European System of Central Banks. The studies were carried out between 2017 and the initial months of 2019 and have been independently published by the authors. The aim of this Occasional Paper is to present the studies in an organic manner, highlighting common features and results.