causal machine-learning approach to increase a charity's fundraising effectiveness. The approach optimally targets …Ineffective fundraising lowers the resources charities can use for goods provision. We combine a field experiment and a … fundraising to individuals whose expected donations exceed solicitation costs. Among past donors, optimal targeting substantially …

We show that warm-glow motives in provision by competing suppliers can lead to inefficient charity selection. In these … situations, discretionary donor choices can promote efficient charity selection even when provision outcomes are non …-competitive effect on charity selection, raising the value of charity provision per dollar of funding. …