AT THE end of October, after eight years in the top job, Jean-Claude Trichet will pass the presidency of the European Central Bank (ecb) to Mario Draghi. Italy's leading central banker thus takes his place in the front row of the fight to push back the euro crisis, bearing every bit as heavy a responsibility as chancellors and presidents. Whatever plans Europe's political leaders draw up at their summit on October 23rd, the ecb's new head will be a vital part of their success—or failure.
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