“Unemployment” is people who are trying to find work divided by themselves + people working. If everyone is living a life of leisure, it will still be low.
Yes, unemployment is a good statistic in that case because it only measures those who are trying and failing to find a job, not those who don’t want or need one.
Well, people are in a much better negotiation position when their next option is some minimum wage undesirable work, instead of no work at all and being unable to survive.
I think it's more nuanced in the types of employment and pay. But I'm also sure I don't even know where to go to get that data.