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Martin Puhl

29 January 2018
WORKING PAPER SERIES - No. 65
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Abstract
The risk reducing benefits of the sovereign bond-backed security (SBBS) proposal of Brunnermeier et al. (2016) have been assessed in terms of the likely losses that different kinds of holders would suffer under simulated default scenarios. However, the effects of mark-to-market losses that may occur when there is rising uncertainty about defaults, or when self-fulfilling destablising dynamics are prevalent, have not yet been examined. We apply the “VAR-for-VaR” method of Manganelli et al. (2015) and the Marginal Expected Shortfall (MES) approach of Brownlees and Engle (2012, 2017) to estimated yields of SBBS to assess how ex ante exposures and marginal contributions to systemic risk are likely to play-out for different SBBS tranches under various securitisation structures. We compare these with exposures/MES of single sovereigns and a diversified portfolio of sovereigns. We find that the senior SBBS has extremely low ex ante tail risk and that, like the low-risk sovereigns, it acts as a hedge against extreme market-wide yield movements. The mezzanine SBBS has tail risk exposure similar to that of Italian and Spanish bonds. Yields on SBBS appear to be adequate compensation for their risks when compared with single sovereigns or a diversified portfolio.
JEL Code
E43 : Macroeconomics and Monetary Economics→Money and Interest Rates→Interest Rates: Determination, Term Structure, and Effects
E44 : Macroeconomics and Monetary Economics→Money and Interest Rates→Financial Markets and the Macroeconomy
E52 : Macroeconomics and Monetary Economics→Monetary Policy, Central Banking, and the Supply of Money and Credit→Monetary Policy
E53 : Macroeconomics and Monetary Economics→Monetary Policy, Central Banking, and the Supply of Money and Credit
G12 : Financial Economics→General Financial Markets→Asset Pricing, Trading Volume, Bond Interest Rates
G14 : Financial Economics→General Financial Markets→Information and Market Efficiency, Event Studies, Insider Trading