Reaping a benefit at the expense of multiple others: How are the losses of others counted?

We investigate individual decisions that produce gains for oneself, while imposing losses on a group of others. We theorize, based on the notion of empathy, that decision-makers consider the magnitude of the pain or loss they inflict on an individual in the group, but are largely insensitive to the number of individuals in the group who suffer losses. Studies involving personal choices or judgments of others’ choices largely confirmed these...