Why is it the employer's responsibility to provide a living wage?

[Rampant.A.I.]

So, it's okay for employers to be too cheap to pay for the labor they get, and they have the right to pass on the moral and social obligations everybody else apparently has.

What is your car worth? Well it is worth what people will pay for it. Why does every other exchange follow that rule except labor? Why the inconsistency?

My view is consistent, cause I think every exchange should follow that rule....including labor.