If a bank can't spare anybody to work the doorway, says Marchese, "I tell branch managers to put a bell over the door and just have everybody on the teller line look up and say hello, " the way chefs do in small sushi restaurants.
For example, when given a description of a woman who is concerned about discrimination and asked if she is more likely to be a bank teller or a bank teller who is a feminist activist, people tend to assume she is the latter even though probability laws tell us she is much more likely to be the former.