The BLS data was only tracking federal minimum. I would like to the state minimum wage earners, but that wasn't in that report.
"so I believe rich city liberals need to change zoning to allow cheap housing to be built."
I believe it's all due to preferences. The preference for sfh, preference for better schools, preference for low crime, etc. It's pretty cheap to live in many north Philly neighborhoods. Many people don't want to.
I agree with the final part. I turned down jobs in college due to the commute cost.
They'd like their kids to go to school without bad influences. You can't watch your kids 24/7 so choosing the kind of people they'll be around is one of the few levers you have as a parent.
Now, if we had a national ethos/culture which the government was empowered to enforce (like Denmark, Japan, etc) then it doesn't matter as much which neighborhood you live in. But living in North Philly is basically dooming your children, what we might call "intergenerational poverty".
Second, for some reason I believe the propaganda that city living is inherently less costly despite it being pricier everywhere in the USA, so I believe rich city liberals need to change zoning to allow cheap housing to be built.
Finally, they're living that way by getting ostensibly making minimum wage, but with so high of commuting time and cost as to be making less per hour but working more than 40. Or by living in miserable conditions: in an RV, 8 people to a 3-bedroom house, etc