New York City is on track to launch 5 city-run grocery stores. Here's what happened when other cities tried them.

Mayor Zohran Mamdani is rolling out his plan for city-run supermarkets in New York. Bloomberg/Getty Images NYC's Mamdani plans to open five city-run grocery stores by 2029, with a 30% discount on core goods. Big cities like Atlanta, along with small towns in Kansas, along with have tried a similar…