Depending on the type of job you also get a different "product" depending on how much you pay and you might not be able to measure it. Employees cut corners in the least visible way and do not brag about extra effort if they are paid well enough.
This[0] was a fun read.
>Nursing care services are the most intensely used hospital services by acute hospital inpatients yet are poorly economically measured [...] >Nurses are an anomaly in the current inpatient billing system. Rather than bill for the actual services provided to the patient or the amount of time spent providing nursing care, the cost of nursing is embedded into the line item for room and board, which is the same fixed cost for every patient receiving the same level of care within a particular institution. In other words, all patients cared for on a given unit are billed the same room and board charge regardless of the actual amount of nursing care the patient utilized during that hospitalization.
[0] - http://frogfind.com/read.php?a=https://www.ncbi.nlm.nih.gov/...