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Capital regulation induced reaching for systematic yield: Financial instability through fire sales

Working paper 673
Working Papers

Gepubliceerd: 13 februari 2020

We investigate whether the omission of systematic risk in rating-based capital regulation induces strategic bond portfolio allocations that decrease financial stability. Capital regulation does not constrain systematic risk-taking by using credit ratings. We verify that this incentivizes banks and insurance corporations to hoard bonds with excessive systematic risk using a confidential bond-level holdings dataset of the ECB. Our findings highlight three interconnected channels through which this systematic risk-taking reduces financial stability by increasing the likelihood and severity of fire sales. Therefore, omitting systematic risk in capital regulation increases the fragility of the financial sector, especially in economic downturns.

Keywords: Credit ratings, systematic risk, regulatory arbitrage, portfolio concentration, capital buffers
JEL codes G11, G21, G22, G24, G28

Working paper no. 673

Updated March 2022 673 - Capital regulation induced reaching for systematic yield: Financial instability through fire sales

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