Powell's inflation miscalculation raises stakes on rate shift

Federal Reserve Chair Jerome Powell, who last year reassured Americans that high inflation would likely be temporary, is expected to offer a darker message this week in the most closely watched speech of his tenure: The fight against spiking prices is far from over.

Powell’s optimistic words at the annual Jackson Hole conference in 2021 were followed by the biggest sustained surge in prices that the U.S. has seen in four decades. Since then, he has shifted gears and sharply stressed the Fed’s commitment to kill high inflation by jacking...