To be clear, I'm not advocating for $4/hr jobs. The parent asked what jobs don't exist because there generally aren't $4/hr jobs for valid reasons.

[And yes, low income jobs may make sense for kids doing babysitting, etc.]

By and large you need a pretty large disparity between middle income jobs and unskilled but reliable labor for a lot of the jobs to exist except for truly wealthy individuals.

The point is $4/hour isn’t sustainable in part due to more-productive people bidding up the cost of living and in part due to almost everyone having better options for employment (or unemployment).