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The court cannot preclude the ECB and other national central banks from doing it, and the only country to suffer if the Bundesbank stopped participating would be Germany, writes Matthias Weber

Less economic integration would make it difficult for the ECB to stabilise the euro area economies. Symmetric monetary policy cannot do anything about this and individual countries would need to use fiscal policy tools.

Well-designed eurobonds would lower financing costs for many euro area countries while hardly or not increasing the costs for the others. These bonds should have an explicit guarantee from the ECB. The bonds could be used up to a limit of GDP (a low number of 10-25% of GDP would allow to observe market reactions before deciding whether to expand). Their introduction would increase the costs on regular German 10-year bonds by at most 10 to 30 basis points.