Julia Giese, Michael McLeay, David Aikman and Sujit Kapadia
Central banks have been using a range of monetary policy and macroprudential tools to maintain monetary and financial stability. But when should monetary versus macroprudential tools be used and how should they be combined? Our recent paper develops a macroeconomic model to answer these questions. We find that two instruments are better than one. Used alone, interest rates can control inflation, but are ineffective for financial stability. Policymakers can do better by also deploying the countercyclical capital buffer, a tool that varies the amount of additional capital banks must set aside. The appropriate combination of tools can vary: both should tighten to counter a joint expansion of credit and activity, but move in opposite directions during an exuberance-driven credit boom.
Robert Hills, Simon Lloyd, Rhiannon Sowerbutts, Dennis Reinhardt, Matthieu Bussière, Baptiste Meunier and Justine Pedrono
Large amounts of capital flow across borders. But these can be destabilising. So can recipient countries employ prudential policies to offset monetary policy changes in centre countries? And does it matter where sending banks are located? Our findings suggest it does. Our case study of French banks operating in London – part of a broader international initiative – suggests prudential policies have a much bigger offsetting effect on French banks’ lending out of the UK’s financial centre than on their lending out of headquarters in France. In line with those observations, we uncover evidence of a ‘London Bridge’ in cross-border lending: the way French banks channel funds to the UK is responsive to prudential policies in the rest of the world.