Tip of the Week: Provide social information to increase gifts
The Wharton School at the University of Pennsylvania recently published a paper called “Field Experiments in Charitable Contributions: The Impact of Social Influence on the Voluntary Provision of Public Goods.” It is great to have this kind of research in the public domain — so much direct mail and fundraising research is proprietary.
The question: will people give more if they are given a suggested donation amount and if they are told how much others have donated? The answer: yes. And there is an especially clear application for this in soliciting renewing donors.
The researchers looked at giving scenarios where the ask is ambiguous (they studied a public radio on-air drive). I’m simplifying the experiment but when donors called to make a pledge, the volunteer either asked if they were a new member or renewing. Then they either 1. Told them that another member had pledged $300 and then asked how much the caller would like to pledge or 2. Simply asked them how much they would like to pledge (without indicating any other gift amounts). They found a 12% larger gift size for those who had the social information (about the $300 gift).
The research included other experiments (email me if you would like more information). The researchers conclude that:
- Providing social information significantly increases contributions.
- It works best when you provide information that is seen as “relevant” to the donor and encourages “social conformity.” Callers who were told that another donor was the same sex (as they) gave significantly more than callers who were told that another donor was the opposite sex (i.e. women give more if they know that other women are giving more).
- There is a “boundary effect.” Use social information drawn from the 90th to 95th percentile of your organization’s contributions. Lower social information has little or no influence, while that over the 99th percentile actually has a negative effect. For example, donors were motivated to give more when they were told about a $600 gift (a number around the 90th percentile of that donor base) than a $1,000 gift (representing the 99th percentile).
You can try this experiment yourself — identify the size of gifts at your 90-95th percentile and use those as anchors in your gift arrays and in your fundraising requests. Tell donors about gifts made by people like them (same sex, family situation, donor level) to inspire larger gifts.




The current issue of The Economist has an interesting article about naming new species as a way to honour people (i.e. the spider named Calponia harrisonfordi) and as a way to fundraise for conservation causes.
A few people have commented on the provocative nature of my