Do Thank-You Calls Increase Charitable Giving? Expert Forecasts and Field Experimental Evidence
通过现场实验研究感谢电话对捐赠者保留率的影响，发现专家预测的80%提升效果实际为零，对筹款实践有重要启示。
Calling to thank donors is considered a key fundraising strategy in the charitable giving industry. Yet the effectiveness of thank-you calls remains untested. We conduct field experiments with public television stations and a national nonprofit in which 500,000 new donors were randomized to receive a thank-you call or not. Fundraising professionals predicted that the calls—which followed standard practices in the industry—would increase donor retention by 80 percent. In stark contrast, we found a precisely estimated null effect of calls on donor retention.