About the Authors

David G. Rand

drand@fas.harvard.edu

Affiliations Program for Evolutionary Dynamics, Harvard University, Cambridge, Massachusetts, United States of America, Berkman Center for Internet and Society, Harvard University, Cambridge, Massachusetts, United States of America

Thomas Pfeiffer

Affiliation Program for Evolutionary Dynamics, Harvard University, Cambridge, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DGR TP. Analyzed the data: DGR TP. Contributed reagents/materials/analysis tools: DGR TP. Wrote the paper: DGR TP.