Federal Reserve Chairman Jerome Powell acknowledged Tuesday that some inflation pressures are stronger and more persistent than he had anticipated, though still not on par with some of the worst episodes the U.S. has seen historically. Under questioning from a special House panel, the central bank leader continued to attribute most of the recent inflation surge to factors closely tied to the economic reopening. Among them, Powell cited airline tickets, hotel prices and lumber along with generally surging consumer demand pumping up an economy that a year ago faced substantial government-imposed restrictions in the early days of Covid-19. Those factors,...