We develop a daily composite index of financial stress for the United Kingdom over 50 years, the UKFSI. The index includes market stress indicators based on their incremental information to capture financial crises. During the COVID-19 crisis, financial stress peaks but remains less severe than during the Global Financial Crisis. The UKFSI is used in a threshold vector autoregression to differentiate the economic dynamics between tranquil and stressful periods. We highlight the importance of nonlinearities that amplify shocks. But we find no evidence of financial shocks contributing to the COVID-19 crisis, possibly reflecting effective policy interventions.
I. IntroductionOver the past five decades, the UK financial sector has been buffeted by a few major shocks, which have highlighted the importance of macro-financial linkages. On the one hand, the severe economic and financial meltdown during the global financial crisis (GFC) was amplified within the banking sector. On the other hand, the spread of the COVID-19 pandemic unleashed profound economic and financial stress, but the shock was partly absorbed by a more resilient banking sector and unprecedented policy support.Against this backdrop, we develop a daily systemic financial stress index for the United Kingdom, the UK Financial Stress Index (UKFSI). We demonstrate its importance for assessing the transmission of financial shocks and the amplification of small shocks during stressful periods.The UKFSI is a daily-from 1971 onwards-composite index of systemic financial stress, that is, it tracks periods characterized by higher volatilities, valuation losses and a JEL Classification numbers: C31, C54, G01, G15. *The authors thank Andy Blake, David Aikman, Lee Foulger and colleagues who participated in Bank of England seminars on the subject. The views expressed are those of the authors and do not necessarily reflect those of the Bank of England (its Monetary Policy Committee, Financial Policy Committee or Prudential Regulatory Committee) nor those of the Bank of Canada. All errors remain our own.