Charitable giving and nonbinding contribution-level suggestions : evidence from a field experiment

When asking for donations, charitable organizations often use suggestions concerning the amount of potential contributions. In our randomized field experiment, opera visitors received solicitation letters asking to support a social youth project organized by the opera house. The three different treatments were: no suggestion and suggestions of €100 and €200, respectively. The findings are that suggestions substantially influence the distribution of donations received. The mean amounts given increase significantly. The increase is stronger in the €200 treatment. On the other hand, the participation rate decreases if a suggestion is made. Overall, the returns from the campaign increase non-significantly.