As a result of a deep and persistent deficiency in aggregate demand, the US economy has been operating far below its potential output level. Real GDP fell by 8% relative to its noninflationary potential in 2008-2009, and has remained about 8% below its previous growth path ever since.
由于总需求持续严重不足，美国经济一直在远低于潜在产出的水平运行。2008—2009年，真实GDP相对无通胀潜在水平降低了8%，此后一直运行于前期增长路径之下8%的水平。