Three fun facts. One, most poor people live in the suburbs. In Atlanta, for example, the figure is 88%. https://www.theatlantic.com/business/archive/2015/01/suburbs.... Two, 80% of people living in poverty have access to a vehicle: https://www.governing.com/topics/transportation-infrastructu.... Three, in post WWII cities, almost all jobs are in suburban and exurban areas. In Atlanta, more than 75% of jobs are outside the city itself (many parts of which are pretty suburban to begin with). 80% of all job growth is outside the city.

So yes, $15/hour employment in exurban areas is actually good for poor people.