Imagine that you have this great idea for a party. You plan the most resplendent décor and exquisite cuisine, lavish flower arrangements, and only the best in lighting and live music. You’ve diligently prepared every detail. Unfortunately, your party isn’t going to be much fun if you skip one essential step: sending out your invitations.
When you go to the grocery store, you generally have a successful relationship with the cashier who rings you up. It’s not much of a relationship, but it is a successful one. This success occurs simply because you and the cashier share a certain mutuality. You care equally about one another, maybe not much, but equally. Since your feelings are mutual, it is easy enough for you both to share a brief and cordial exchange. Why?