E.g. as a software developer in Silicon Valley, my salary is somewhat large compared to the rest of the world, but my lifestyle is fairly unremarkable for a working professional (2 used cars, a house that needs updates, weekends off, vacation time, etc).
I could move somewhere with a lower cost of living, and my compensation would decrease, and if I did the same job I would probably live approximately the same lifestyle (perhaps with marginal improvements to the house considering SV's real estate situation).
If I moved up the career ladder my lifestyle would improve a bit; if I moved down my lifestyle would get a bit worse.
Using this rubric of job type = lifestyle, what kind of lifestyle is a minimum-wage job meant to support? There will always be a bottom-rung lifestyle, and those that support themselves on minimum-wage jobs will always occupy the next rung up from the bottom. The ladder itself may move up or down, but compared to fellow workers in other jobs, they will always feel the delta. And that's what this is really about, the unhappiness caused by seeing that delta.
We were never meant to support entire families on minimum wage jobs.