In a study published on Friday, the ECB said a digital euro could help where citizens have abandoned cash, foreign forms of electronic money have taken over, or other means of payments have become unavailable.
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"We should be ready to issue a digital euro if and when developments around us make it necessary," Panetta said in a blog post accompanying the study. "This means that we already need to be preparing for it."
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The ECB gave itself until the middle of next year to decide whether to go forward with the project, which is now open for public consultation.