Jerome H. Powell, the chair of the Federal Reserve, pledged during a closely watched speech that his central bank would stick by its push to stamp out high inflation “until the job is done” and said that officials stood ready to raise interest rates further if needed.Mr. Powell, who was speaking Friday at the Federal Reserve Bank of Kansas City’s annual Jackson Hole conference in Wyoming, said that the Fed would “proceed carefully” as it decided whether to make further policy adjustments after a year and a half in which it had pushed interest rates up sharply.But even as Mr. Powell emphasized that the Fed is trying to balance the risk of doing too much and hurting the economy more than is necessary against the risk of doing too little, he was careful …
