Teaching in public schools would definitely fit in this category.
((Assuming we're talking about the US))
A lot of (rural) areas in the South are so poor, teachers are among the higher pay scale because they have a steady paycheck with health insurance. My area was a city though, so teachers were on the lower end.
Snark aside, it's hard to imagine how you could raise kids plural on what a teacher makes here in Seattle. Even the absolute top of the teacher salaries here, after 12 promotions and with a PhD, pay about what my very first tech job did, many years and much inflation ago. I would never have tried to raise kids on that money.
Maybe not fresh-out-of-college but after 5ish years they almost certainly can afford it.
The playground supervisors probably can't though.
Employers in high cost areas take advantage of the informal subsidies being discussed here to underpay social workers (as well as other socially valuable occupations such as teachers). But that won't change until the workers move away or switch occupations. There's just no incentive for employers to pay living wages as long as workers are willing to accept less.
Aside: what is the gender neutral term for Garbage Man? Garbage people sounds like I'm disparaging them.
1. We generally value as a society
2. Two people both working the job and married to each other cannot afford to raise two children.
There are some jobs which we romanticize as being this way (musicians and other artists being a big example), but are we okay with e.g. social workers all either starving, or from wealthy backgrounds?