Deutsche Bank shares slide 11% after sudden spike in the cost of insuring against its default
Deutsche Bank shares fell 11% on Friday after a spike in credit default swaps on Thursday night, as concerns about the stability of Europe's banks persisted.
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### Instruction: Deutsche Bank shares slide 11% after sudden spike in the cost of insuring against its default

### Response: Deutsche Bank shares fell 11% on Friday after a spike in credit default swaps on Thursday night, as concerns about the stability of Europe's banks persisted.