Wharton finance professor Jeremy Siegel said he thinks the Federal Reserve is underestimating the degree to which inflation will be a problem, likely forcing the central bank into a sharper pivot away from stimulus and potentially catching markets off guard. Siegel, known for upbeat forecasts, made the gloomy prediction in an interview on CNBC on Oct. 1, saying he thinks “we’re headed for some trouble ahead.” “Inflation, in general, is going to be a much bigger problem than the Fed believes,” Siegel said, adding that he believes the persistence of elevated prices is going to pressure the Fed to accelerate...