Former Treasury Secretary Lawrence Summers said that Federal Reserve Chair Jerome Powell ought to signal the possibility of raising interest rates four times next year, in order to restore what he argues is the central bank’s lost credibility on fighting inflation. “I’d be signaling four rate increases next year -- with two-sided uncertainty, depending on how the inflation figures of work out,” Summer said on Bloomberg Television’s “Wall Street Week” with David Westin. “That will be a jolt. But a jolt is what is required to restore credibility.” Summers said that his key takeaway from Friday’s November employment ... (full story)