Friends with Health Benefits: A Field Experiment

The authors thank Y. Park, T. Lee, J. Hutchings, and the Behavior Change for Good Initiative at the University of Pennsylvania for research assistance. The authors also thank U. Gneezy, G. Loewenstein, J. Kessler, and the Washington University Journal Club for feedback on the manuscript. The authors thank the UC San Diego fitness centers for partnering with them for the main study and the Washington University fitness centers for partnering with them for the pilot study. The authors declare no competing interests. Anonymized data, code, and study materials are available on ResearchBox: https://researchbox.org/2266&PEER_REVIEW_passcode=ONGMFV.