"We're encouraging our customers to understand the idea of shared responsibility and to do what they can within their means," says Kate Antonacci, director of societal impact initiatives. Cafes are equipped with cash registers allowing customers to pay with debit or credit, but payment is given anonymously. Panera offers suggested donation amounts based on prices in regular cafes. On average, 60% leave the suggested amount. "In order for this to work you have to have people coming in who are able to contribute," says Antonacci. Although there are some months when the cafes don't bring in enough to cover operating costs, the goal is for them to become self-sufficient under the PWYW model. What Panera does right: