The author claims that shelves weren't being stocked because the employee mix had been shifted towards part-time workers.
OK, accurate or not, it says nothing at all about the total number of available 'worker-hours' just that the full/part-time mix had changed. It simply doesn't follow logically that there would be a shortage of labor just because the mix changed.
They treat employees like crap and pay them as little as possible. Thus they get exactly what they pay for; sullen workers who do the bare minimum not to get fired.
Sure that is possible but that is a different argument. The author should have made that point explicitly if that was indeed the situation (and provided evidence).
OK, accurate or not, it says nothing at all about the total number of available 'worker-hours' just that the full/part-time mix had changed. It simply doesn't follow logically that there would be a shortage of labor just because the mix changed.