The three developments began on December 12 in the United States, where the Federal Reserve, led by Ben Bernanke, announced that it will go much further than doubling (to $1 trillion) the volume of market securities that it intends to buy in 2013 in order to stimulate the economy. The Fed also left no doubt that it will maintain its foot on the accelerator until the US unemployment rate declines significantly, at least to 6.5%, and as long as inflation is contained at or below 2.5%.
这三项进展始于12月12日的美国，由伯南克领导的美联储宣布将采取比2013年拟定市场证券采购量翻番更有力的措施来刺激经济。美联储还明确表示只要通胀率控制在2.5%或以下，就将在美国失业率大幅降至6.5%以前持续刺激经济。