Following the financial crisis, central banks and regulatory authorities assumed new powers to set macroprudential bank capital requirements. This column describes a number of macro models used by the ECB to measure the real impact of capital requirements and their interactions with monetary policy. It warns that a weaker banking system amplifies the impact of monetary policy and contributes to economic instability. Banks’ capital buffers are best augmented during times of affluence, when looser monetary policy can mitigate the costs of increasing capital requirements.
Gabriele Cozzi, Matthieu Darracq Pariès, Peter Karadi, Jenny Körner, Christoffer Kok, Falk Mazelis, Kalin Nikolov, Elena Rancoita, Alejandro Van der Ghote, Julien Weber