Fig. 1: Example of trials in the self-report and expression/reputation conditions.

Participants were presented with two distributions of outcomes for themselves and their partner. They were also informed which distribution their partner chose and asked to report which of four emojis (i.e., neutral, happy, angry, and sad) best represented how they felt or which of four emojis they would like to send to their partner. Each trial is characterized by three situational attributes that captured the difference between the chosen and unchosen option: difference in outcomes for the participant ($Self), difference in outcomes for their partner ($Other), and difference in the absolute inequality of outcomes ($Ineq). For example, in this example trial: $Self = 65 – 50 = 15; $Other = 38 – 50 = –12; $Ineq = | 65 – 38 | – | 50 – 50 | = | 27 | – | 0 | = 27.