The emergence of hyper-altruistic behaviour in conflictual situations

TL;DR

This study reveals that in conflictual decision-making scenarios, a significant portion of individuals exhibit hyper-altruistic behavior, often acting contrary to traditional economic predictions, especially when exit options are available or restricted.

Contribution

The paper provides experimental evidence of hyper-altruistic behavior in conflict situations and highlights the need to revise economic models to incorporate such behaviors.

Findings

About one sixth of subjects show hyper-altruism.

Exiting is more common when allowed and costless.

Females are more likely to exit when the cost is small.

Abstract

Situations where people have to decide between hurting themselves or another person are at the core of many individual and global conflicts. Yet little is known about how people behave when facing these situations in the lab. Here we report a large experiment in which participants could either take $x$ dollars from another anonymous participant or give $y$ dollars to the same participant. Depending on the treatments, participants could also exit the game without making any decision, but paying a cost. Across different protocols and parameter specifications, we provide evidence of three regularities: (i) when exiting is allowed and costless, subjects tend to exit the game; (ii) females are more likely than males to exit the game, but only when the cost is small; (iii) when exiting is not allowed, altruistic actions are more common than predicted by the dominant economic models. In particular, against the predictions of every dominant economic model, about one sixth of the subjects show hyper-altruistic tendencies, that is, they prefer giving $y$ rather than taking $x>y$. In doing so, our findings shed light on human decision-making in conflictual situations and suggest that economic models should be revised in order to take into account hyper-altruistic behaviour.