I swear, I would like to donate later
研究在在线筹款中，在承诺捐款的语句前加上“我发誓”能否减少事后反悔，发现这能显著提高即时捐款和承诺兑现率，尤其对道德认同感低的人有效。
Abstract Pledges are ubiquitous in charitable giving, but they are often reneged upon. To investigate whether adding the phrase “I swear” to pledge language can reduce pledge reneging, we conduct a series of experiments in the context of online fundraising. We find that including “I swear” at the beginning of the pledge language significantly increases immediate giving and pledge fulfillment, with more individuals switching from pledging to giving immediately. We also observe individual heterogeneity in moral identity: Our findings are present among individuals with low moral identity, but not among those with high moral identity. Our paper presents a simple and no-cost strategy for increasing the effectiveness of pledges in online fundraising.