All participants were asked to spend the money in line with their assigned spending direction by 5pm that day. Participants were then contacted in the evening hours (between 6pm-8pm) on the phone by a research assistant to complete a follow-up survey which assessed their current happiness level. As predicted, participants asked to spend their windfall in a prosocial fashion were happier at the end of the day than were participants in the personal spending condition. Interestingly, the amount of money people were given did not influence how happy they were that evening, suggesting that how people spent their money was more important than how much money they received. Therefore, this experimental study provides support for the causal claim that spending money on others leads to higher happiness than spending money on oneself. Moreover, these results suggest that the spending amount need not be large to facilitate positive hedonic gains, as prosocial purchases made with as little as five dollars were sufficient to boost happiness levels.