From the Marketplace: The vaccine mandate movement is growing. Federal workers will have to get vaccinated or get weekly COVID-19 tests. Similar mandates are happening in California and New York. There’s also a long list of universities, hospitals and, increasingly, private corporations that are making the move, most recently Walmart. But there’s a catch: The company is going to require vaccines for corporate employees but not retail workers. Most employers have been doing what they can to encourage workers to get vaccinated. Now, virus variants are helping make their case. There’s a labor shortage in retail, and a mandate could feel intrusive to front-line workers, said Gretchen Chapman, who researches vaccination behavior at Carnegie Mellon University. Many of them have been on the job since last March. Read the full story in Marketplace.