Thorsten Beck, Olivier De Jonghe, Klaas Mulier, 09 May 2017

There is little empirical evidence that specialised banks are less stable or perform worse, as suggested by standard portfolio diversification theory. This column uses new data to argue that more specialised banks between 2002 and 2012 did not perform as theory would suggest. More specialised banks, and banks with similar sectoral exposures to their peers, suffered less volatility and had lower exposure to systemic risk. The lack of post-crisis regulatory reform in this area may, accidentally, have been a good thing.