Markets are also jittery at the start of an eventful week that will see the U.S. second-quarter earnings season kick off, the release of inflation data in several countries, and testimony by Federal Reserve Chair Jerome Powell which will be scrutinised for any talk of tapering. Investors are eager to assess whether the earnings season will support Wall Street's run higher, with the S&P 500 .SPX up roughly 16% for the year so far, underpinned by the expected earnings surge. JPMorgan JPM.N, Goldman Sachs GS.N, Bank of America BAC.N and other big banks kick off results from Tuesday .