109. Correctly measuring the productivity of service workers is complex. Consider, for example, postal workers: they are often said to be more productive if more letters are delivered per postal worker. But is this really true?What if more letters are lost or delayed per weoker at the same time that more are delivered?
The objection implied above to the productivity measure described is based on doubts about the truth of which of the following statement?
不明白那个问题是什么意思？请大家帮忙解答一下 | 
