Criticality is not the only factor when it comes to pay. Supply of capable people also plays a part. IE city garbage collection is critical, but finding staff

Criticality is not the only factor when it comes to pay. Supply of capable people also plays a part. IE city garbage collection is critical, but finding staff to do it isn't too hard. For me, when the salary/wage falls below living standards is the issue. Hence minimum wage should be a thing.