FAP, May 8 / PRNewswire-FirstCall-Asianet /-- Bill Winters, chief executive of Standard Chartered Group, said that after the recent turmoil led to the failure of four American banks, including Silicon Valley Bank, the view that banks were "too big to fail" needed to be re-examined. "the too-big-to-fail problem comes up again and again, but as we just saw, $250 billion Silicon Valley banks are traditionally considered too big to fail. So the overall concept of what a bank is too big to fail has to be re-examined," Winters said on the sidelines of the Dubai Financial Technology Summit.