National central banks within the Eurosystem with substantial holdings of own risky sovereign debt are at material risk of default if their sovereign defaults, since the likelihood of recapitalisation of an insolvent national central bank by its defaulted sovereign is low. Risk exposures of a national central bank that are out of line with the risk exposures of the consolidated Eurosystem are therefore an existential threat to the monetary union. This column discusses the key flaws in the design of the Eurosystem responsible for this threat and
explores three approaches to reducing the insolvency risk of national central banks.

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