Let's say I have only enough work for 8 hours a week. Should I hire someone for 40 just to give them "full employment"? What benefit do I get from that?
Or let's say I only have enough capital to pay for 8 hours a week. Should I run myself out of business hiring and paying someone for 40 just because it's "nice"?
Also, we have to get into the actual value of the work provided. What is the value of the job performed? That's an incredibly complicated function and I don't really know the answer to it.
And then you do have people who are abusing their power to pay less than they should. Companies who lean on their employees being able to qualify for welfare even with a full 40 hours.
I think that at the very least, a full-time, 40 hour a week job should be able to enable someone to acquire room and board for themselves.