(Reuters) -JPMorgan Chase CEO Jamie Dimon expressed confidence in a robust U.S. economy backed by strong employment and healthy consumer finances. The U.S. economic boom is "unbelievable," Dimon said at an Economic Club of New York event on Tuesday. Dimon, who has run the largest U.S. lender for more than 18 years, has cautioned that inflation could be more persistent than expected, keeping interest rates higher for longer. Read this story