Banks smashed profit estimates in the second quarter as the economy rebounded, with Wells Fargo WFC.N, Bank of America Corp BAC.N, Citigroup C.N and JPMorgan Chase JPM.N posting a combined $33 billion in profits. Some of the world's biggest banks kick off U.S. earnings, just as investors fret over inflation, surging energy prices and the upcoming tapering of the Federal Reserve's $120 billion monthly stimulus. As Britain's economy shows signs of slowing amid rising prices, supply chain disruptions and staff shortages, upcoming data releases will grab attention.