The call is still out on this approach (I'm guessing it is the new owner Amazon's idea), but I thought it can be a good example of visualization and face to face communication! [..makes stock position obvious to customers, employees, and store leadership.] [Employees can communicate with customers on status of product rather than a tag.]
http://www.businessinsider.com/whole-foods-internal-documents-on-empty-shelves-2018-1