倘使迹象能使我们相信的话,六十年代中期以来,美国的生产增长速度已有了显著减慢。例如经济顾问委员会发现,按每个工时计算的产出率,而在1948—1966年平均每年为3.3%,而在1967—1973年已减为2.1%。官方的资料指出,1973—1977年又进一步恶化到1.2%。虽然大家都同意美国生产增长速度是 If signs can convince us, the U.S. production growth rate has slowed significantly since the mid-1960s. For example, the Council of Economic Advisers found that the rate of output per hour worked, on average, at 3.3% per year for 1948-1966 and 2.1% for 1967-1973. Official sources indicate that it further worsened to 1.2% in 1973-1977. Although we all agree that the U.S. production growth rate is