Citing the fact that the real gross domestic product (GDP) per capita was higher in 1997 than ever before, some journalists have argued that the United States economy performed ideally in 1997. However, the real GDP is almost always higher than ever before; it falls only during recessions. One point these journalists overlooked is that in 1997, as in the twenty-four years immediately preceding it, the real GDP per capita grew nearly one-half percent a year more slowly than it had on average between 1873 and 1973. Were the 1997 economy as robust as claimed, the growth rate of real GDP per capita in 1997 would have surpassed the average growth rate of real GDP per capita between 1873 and 1973 because over fifty percent of the population worked for wages in 1997 whereas only forty percent worked for wages between 1873 and 1973. If the growth rate of labor productivity (output per hour of goods and services) in 1997 had equaled its average growth rate between 1873 and 1973 of more than two percent, then, given the proportionately larger workforce that existed in 1997, real GDP per capita in 1997 would have been higher than it actually was, since output is a major factor in GDP. However, because labor productivity grew by only one percent in 1997, real GDP per capita grew more slowly in 1997 than it had on average between 1873 and 1973.
The passage is primarily concerned with

文章类型:学术研究
文章套路:观点对比
文章介绍了 Frazier 和 Mosteller 认为医学研究的临床试验需要进行方式转变。后面的文章则解释了他们认为该如何转变,并且他们认为应该转变的理由
题目类型: Main Idea
选项解析:
A、文章提到医学研究的实践是为了展示 Frazier 和 Mosteller 认为应该转变临床方式的理由
B、不仅仅讨论了会提高成本的医学实验,还讨论了如何改进。
C、并不只是在评估现在医学实验实践的缺点
D、正确答案
E、 并不是说当代研究者的研究方式可能发生改变,而是 Frazier 和 Mosteller 提出了改进的方法

