To appreciate fully the unique character of this consumer-demand shortfall, trends over the past 21 quarters need to be broken down into two distinct sub-periods. First, there was a 2.2% annualized decline from the first quarter of 2008 through the second quarter of 2009.
为了充分理解这一消费需求短缺的独特特征，过去21个季度的趋势可以被分为两个不同的次级阶段。首先是2008年一季度到2009年二季度，此阶段出现了2.2%的年化下降。这是拜危机所赐，高峰是2008年后两个季度，年化下降达4.5%。