CISS - A Composite Indicator of Systemic Stress in the Financial System

Abstract

This paper introduces a new indicator of contemporaneous stress in the financial system named Composite Indicator of Systemic Stress (CISS). Its specific statistical design is shaped according to standard definitions of systemic risk. The main methodological innovation of the CISS is the application of basic portfolio theory to the aggregation of five market-specific subindices created from a total of 15 individual financial stress measures. The aggregation accordingly takes into account the time-varying cross-correlations between the subindices. As a result, the CISS puts relatively more weight on situations in which stress prevails in several market segments at the same time, capturing the idea that financial stress is more systemic and thus more dangerous for the economy as a whole if financial instability spreads more widely across the whole financial system. Applied to euro area data, we determine within a * We thank Philipp Hartmann for inspiring and supporting this project throughout all stages. Philipp also invented the indicator’s name and its abbreviation CISS (pronounced like “kiss”). We thank Tommy Kostka for excellent research assistance and for several good ideas which helped improving the CISS. Very helpful comments from Geert Bekaert, Wolfgang Lemke, Simone Manganelli and an anonymous referee are gratefully acknowledged. We finally thank participants at the Euro Area Business Cycle Network conference “Econometric Modelling of Macro-Financial Linkages” in Florence and the 5th CSDA International Conference on Computational and Financial Econometrics in London for fruitful discussions and comments. However, the views expressed in this paper are those of the authors and do not necessarily reflect those of the European Central Bank, the Eurosystem or the Magyar Nemzeti Bank.  Corresponding author: Tel. +49 69 1344 7065.