Social Discounting
研究发现，人们愿意放弃的金额随与受赠者的社会距离增加而呈双曲线式下降，这种模式与时间和概率折扣类似。
The amount of money a person was willing to forgo in order to give 75 dollars to another person decreased as a hyperbolic function of the perceived social distance between them. Similar hyperbolic functions have previously been shown to describe both time and probability discounting.