While the common rule of thumb for a recession is two consecutive quarters of falling GDP, the NBER uses other data to determine when recessions begin and end including employment statistics.

• 虽然共同的经验法则的衰退是连续两个季度下降，国内生产总值，国家经济研究局使用其他数据，以确定何时衰退开始和结束，包括就业统计。