Recent studies find ample evidence that monetary and immaterial gifts influence effort in the workplace. We investigate the impacts of monetary gift exchange and of expressions of respect on salespersons' reciprocity when purchasing doner durum, a common lunch snack. Prior to the food’s...

We study how the distribution of other-regarding preferences develops with age. Based on a set of allocation choices, we can classify each of 717 subjects, aged 8 to 17 years, as either egalitarian, altruistic, or spiteful. Varying the allocation recipient as either an ingroup or an out-group...