Wall Street's $9B windfall fuels a Nobel-inspired$10B bet by JPMorgan to reshape the US economy.gettyA palpable sense of optimism is returning to Wall Street, as the long-dormant engine of high-stakes dealmaking roars back to life. Investment banking revenues at the financial district’s five largest institutions, JPMorgan Chase, Bank of America, Citigroup, Goldman Sachs and Morgan Stanley, which will be announced later this week, are poised to break through the $9 billion threshold in the third quarter for ...