> Only because working for somebody else was not the norm
While it may not have been the norm, it was certainly common. Apprentices at a craft, or journeyman, worked for the masters of their craft. Children worked for their parents. Guards worked for local landowners or nobility, and anyone who sold goods or services worked for their clients. Standing armies were far more rare, but existed, and merceneries also had employees. Out of work mercenaries were also a very _dangerous_ unemployment problem.