The Sunny Side of Fairness

TLDR

Fairness research has largely conflated emotional and monetary motives, leaving the positive emotional impact of fairness and its conflict with financial interests poorly understood. The study examined how fair versus unfair offers affect self‑reported happiness and brain activity, controlling for monetary payoff. Participants reported happiness and underwent fMRI while receiving fair and unfair offers matched for monetary value. Fair offers increased happiness and reward‑region activation, whereas accepting unfair offers engaged emotion‑regulation areas and reduced negative‑affect regions, supporting that fairness is hedonically valued and that tolerating unfairness for gain suppresses negative affect.

Abstract

Little is known about the positive emotional impact of fairness or the process of resolving conflict between fairness and financial interests. In past research, fairness has covaried with monetary payoff, such that the mental processes underlying preference for fairness and those underlying preference for greater monetary outcome could not be distinguished. We examined self-reported happiness and neural responses to fair and unfair offers while controlling for monetary payoff. Compared with unfair offers of equal monetary value, fair offers led to higher happiness ratings and activation in several reward regions of the brain. Furthermore, the tendency to accept unfair proposals was associated with increased activity in right ventrolateral prefrontal cortex, a region involved in emotion regulation, and with decreased activity in the anterior insula, which has been implicated in negative affect. This work provides evidence that fairness is hedonically valued and that tolerating unfair treatment for material gain involves a pattern of activation resembling suppression of negative affect.