Competition over Personal Resources Favors Contribution to Shared Resources in Human Groups

• Jessica L. Barker ,

  * E-mail: jlbarker@arizona.edu

  Current address: Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona, United States of America

  Affiliation Department of Neurobiology and Behavior, Cornell University, Ithaca, New York, United States of America

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• Pat Barclay,

  Affiliation Department of Psychology, University of Guelph, Guelph, Ontario, Canada

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• H. Kern Reeve

  Affiliation Department of Neurobiology and Behavior, Cornell University, Ithaca, New York, United States of America

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