时任美联储主席伯南克（Ben Bernanke）将问题归结于有巨大贸易盈余的国家购买了太多的美国国债，从而抵消了美联储从紧的货币政策。
According to then-Fed Chairman Ben Bernanke, the problem was that countries running large surpluses were buying so many US Treasuries that they were negating the Fed’s monetary-policy efforts.