It’s a question that has puzzled thinkers for centuries: Are we humans alone in our pursuit of fairness and the frustration we feel when others get what we want?
In recent years, evolutionary psychologists have suggested that we’re not all that special. Animals, from corvids to capuchin monkeys, express what humans might recognize as jealousy when, for example, they are passed over for a sought-after snack. Many argue this is evidence we are not alone in our aversion toward unfairness.
But new research from the University of California, Berkeley, makes the case that humans...
