Why Do People Give? Testing Pure and Impure Altruism

We thank Kong Wah Lai, Michael Menietti, and Linnea Warren who helped conduct the experiments. We thank Sandi Wraith and the American Red Cross of South Western Pennsylvania for their help in facilitating our research. We are grateful to Bo Honoré for extending his Stata code for the two-sided fixed-effects censored estimator to models with variable censoring levels. Seminar participants at Duke, NYU, IUPUI, and Stanford are thanked for helpful comments. Finally, we are grateful for generous financial support from the Research Fund of the Indiana University Lilly Family School of Philanthropy. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.