Map via The NY Times Because of rising rents and lowering profit margins, supermarkets city-wide have been disappearing, according to a recent study. New York's boroughs have been especially hard hit, forcing low-income residents like Fort Greene's Della Dorsett to power her electric wheelchair several blocks uphill along Myrtle Avenue, "returning home with plastic bags dangling from handles and nestled between her feet." Something to think about next time the lines jam up at......