Partial mandates at Walmart and others may widen a class divide. : By Andrew Ross Sorkin, Jason Karaian, Sarah Kessler, Stephen Gandel, Lauren Hirsch and Ephrat Livni The tide has begun to turn on corporate vaccine mandates, with companies including Disney, Facebook, Google and Walmart recently introducing stricter requirements for employees returning to the workplace. But the policies come with some important caveats as executives juggle public health, labor relations and the bottom line. Walmart’s vaccination mandate doesn’t cover the company’s most vulnerable employees: workers at its stores and warehouses.