Revisiting Brosnan and de Waal 2003

In a paper published in Nature in 2003, Sarah Brosnan and Frans de Waal provided what was, arguably, the first evidence for inequity avoidance in a non-human animal. Brosnan and de Waal found that brown capuchin monkeys, refused to participate in trials if they observed conspecifics receiving a more attractive award for performing the same …