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By Tracie McMillan

Ms. McMillan is a journalist covering the working class and food insecurity.

On the first Monday morning in June, Jocelyn Walker waited for her car clock to tick 9 a.m., then scrolled her cellphone call history for a number she dials often. She had 30 minutes to spare before seeing her first client of the day at Revived Styles, the natural hair business she runs in a suburb of Detroit.

“Usually I call early in the morning,” Ms. Walker told me. She learned her lesson a couple of years ago, when a paperwork error canceled the food stamps and Medicaid that she and her now 8-year-old son rely on.