As a result of the continuing decline in the birth rate, [fewer people] will enter the labor force [in the 1980’s] than (few people省略) did [in the 1960’s and 1970’s], a twenty-year period during which people born after the war swelled the ranks of workers.
我有个疑问! 这里比较, 时态发生变化 后面的可以只用助动词did吗??不是应该重复entered? 而且为什么是will enter 不是would enter?