The heyday of US economic growth in the two decades after World War II was also a golden era for the middle class. The long boom of the 1990s, when the US enjoyed sustained full employment, was one of few periods in the last 40 years when incomes climbed at every quintile of the income distribution.
二战后的二十年是美国经济增长的黄金时期，也是中产阶级的黄金时期。20世纪90年代的长时间繁荣——长久保持充分就业状态——是过去40年中少有的收入分配各层次所得全面增长的时期。