Over the past three decades, the US has been able to grow at an average annual rate of around 2.5%. Some attribute relatively slow growth to demographic factors, which have reduced the labor force, as well as to weak productivity levels, which have been low.
在过去三十年中，美国能够以平均每年2.5%的速度增长。一些人将相对较慢的增长归因于人口因素，人口因素导致劳动力减少和已然低迷的生产率水平进一步恶化。