Fed faces a 'surprise' problem on U.S. inflation

``Of particular concern for the Fed are recent undershoots on key gauges of inflation that have been lagging the central bank's stated target of 2 percent annualized consumer price growth... With doubts rising over U.S. President Donald Trump's ability to deliver policies to promote faster economic growth, many of these gauges have fallen back to near Election Day levels.... Citi's inflation surprise indexes underscore the Fed's anxiety... recent U.S. inflation readings have returned to their long-term trend of underperforming against forecasts after a brief run of upside surprises earlier this year.''