Actually jobs like Walmart would only support an individual, most likely living at home with their elderly parents or shaking in an apartment with others. It may support a one job couple, but they would be at poverty level, unless they were retired on pensions. I honestly don't know how anyone in todays world could live on 300 bucks a week.
300/wkx50wks/year=$15,000 a year.
No, I expect you don't know anyone who could live on that. But most people you know don't know how to live cheaply.
I don't expect that you shop at the 99 cent store either.