Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We report the results of experiments designed to investigate the effects of random public revelation of individual choices on voluntary contributions to a public good. Varying the number of subjects whose contributions are made public, we find that public revelation always leads to higher contributions. Revealing the choices of three and five individuals leads to higher contributions than revealing one individual’s contribution, but there is not a significant difference between revealing the contributions of three or five subjects.