GMAT Critical Reasoning (CR) | Re: QOTD: Correctly measuring the productivity of service workers

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 worker at the same time that more are delivered?

Truth: Postal workers = Productive BUT lost letters? = Quality of services. We need to find an answer choice which has both of these points.

The objection implied above to the productivity
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