Is there such a thing as an ethically fair wage for the time and effort you require from a regular laborer?
Pure economics says that the job is worth what anyone will take.
Is there a moral, ethical, and or religious/biblical take on that that modifies that understanding?
It’s not just economics that says the job is worth what people are willing to get paid for it, that’s the moral position too. If I’m willing to do that job for that money then I am voluntarily entering into the agreement and there’s nothing wrong with you “only” paying me that much.