A growing literature in economics has studied how fairness considerations shape human behavior. This research collection comprises forty key theoretical and empirical contributions spanning the last four decades, along with influential related work in normative economics. These papers show that the fairness motive is essential for understanding human behavior in a wide range of settings, such as markets, bargaining, and redistributive situations. They document large heterogeneity in what people view as fair and the importance people attach to fairness, displaying how a concern for fairness...