Deutsche Bank shares plunge, default insurance at highest since 2018
Deutsche Bank shares tumbled on Friday after the cost of insuring the bank's debt against the risk of default shot to more than four-year highs, highlighting concerns among investors about the stability of Europe's banks.
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### Instruction: Deutsche Bank shares plunge, default insurance at highest since 2018

### Response: Deutsche Bank shares tumbled on Friday after the cost of insuring the bank's debt against the risk of default shot to more than four-year highs, highlighting concerns among investors about the stability of Europe's banks.