Collaboration encourages equal sharing in children but not in chimpanzees

Abstract

Humans actively share resources with one another to a much greater degree than do other great apes, and much human sharing is governed by social norms of fairness and equity1,2,3. When in receipt of a windfall of resources, human children begin showing tendencies towards equitable distribution with others at five to seven years of age4,5,6,7. Arguably, however, the primordial situation for human sharing of resources is that which follows cooperative activities such as collaborative foraging, when several individuals must share the spoils of their joint efforts8,9,10. Here we show that children of around three years of age share with others much more equitably in collaborative activities than they do in either windfall or parallel-work situations. By contrast, one of humans’ two nearest primate relatives, chimpanzees (Pan troglodytes), ‘share’ (make food available to another individual) just as often whether they have collaborated with them or not. This species difference raises the possibility that humans’ tendency to distribute resources equitably may have its evolutionary roots in the sharing of spoils after collaborative efforts.

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Figure 1: Child study tasks.
Figure 2: Rates of equal shares.
Figure 3: Chimpanzee study task.

References

  1. 1

    Fehr, E. & Fischbacher, U. The nature of human altruism. Nature 425, 785–791 (2003)

    ADS  CAS  Article  Google Scholar 

  2. 2

    Gurven, M. To give or not to give: an evolutionary ecology of human food transfers. Behav. Brain Sci. 27, 543–583 (2004)

    Article  Google Scholar 

  3. 3

    Henrich, J. et al. “Economic man” in cross-cultural perspective: behavioral experiments in 15 small-scale societies. Behav. Brain Sci. 28, 795–855 (2005)

    Article  Google Scholar 

  4. 4

    Benenson, J. F., Pascoe, J. & Radmore, N. Children’s altruistic behavior in the dictator game. Evol. Hum. Behav. 28, 168–175 (2007)

    Article  Google Scholar 

  5. 5

    Fehr, E., Bernhard, H. & Rockenbach, B. Egalitarianism in young children. Nature 454, 1079–1083 (2008)

    ADS  CAS  Article  Google Scholar 

  6. 6

    Blake, P. R. & Rand, D. G. Currency value moderates equity preference among young children. Evol. Hum. Behav. 31, 210–218 (2010)

    Article  Google Scholar 

  7. 7

    Gummerum, M., Hanoch, Y., Keller, M., Parsons, K. & Hummel, A. Preschoolers’ allocations in the dictator game. The role of moral emotions. J. Econ. Psychol. 31, 25–34 (2010)

    Article  Google Scholar 

  8. 8

    Tomasello, M. Why We Cooperate (MIT Press, 2009)

    Google Scholar 

  9. 9

    Sterelny, K. Social intelligence, human intelligence and niche construction. Phil. Trans. R. Soc. B 362, 719–730 (2007)

    Article  Google Scholar 

  10. 10

    de Waal, F. B. M. & Berger, M. L. Payment for labour in monkeys. Nature 404, 563 (2000)

    ADS  CAS  Article  Google Scholar 

  11. 11

    Hill, K. Altruistic cooperation during foraging by the Ache, and the evolved human predisposition to cooperate. Hum. Nature 13, 105–128 (2002)

    Article  Google Scholar 

  12. 12

    Boesch, C. & Boesch, H. Hunting behavior of wild chimpanzees in the Tai-National-Park. Am. J. Phys. Anthropol. 78, 547–573 (1989)

    CAS  Article  Google Scholar 

  13. 13

    Muller, M. & Mitani, J. C. in Advances in the Study of Behavior (eds Slater, P. J. B., Rosenblatt, J., Snowdon, C., Roper, T. & Naguib, M.) 275–331 (Elsevier, 2005)

    Google Scholar 

  14. 14

    Hill, K., Barton, M. & Hurtado, A. M. The emergence of human uniqueness: characters underlying behavioral modernity. Evol. Anthropol. 18, 187–200 (2009)

    Article  Google Scholar 

  15. 15

    Marlowe, F. W. Hunter-gatherers and human evolution. Evol. Anthropol. 14, 54–67 (2005)

    Article  Google Scholar 

  16. 16

    Gilby, I. C. Meat sharing among the Gombe chimpanzees: harassment and reciprocal exchange. Anim. Behav. 71, 953–963 (2006)

    Article  Google Scholar 

  17. 17

    Mitani, J. C. & Watts, D. Why do chimpanzees hunt and share meat? Anim. Behav. 61, 915–924 (2001)

    Article  Google Scholar 

  18. 18

    Thompson, C., Barresi, J. & Moore, C. The development of future-oriented prudence and altruism in preschoolers. Cogn. Dev. 12, 199–212 (1997)

    Article  Google Scholar 

  19. 19

    Rochat, P. et al. Fairness in distributive justice by 3- and 5-year-olds across seven cultures. J. Cross Cult. Psychol. 40, 416–442 (2009)

    Article  Google Scholar 

  20. 20

    Warneken, F., Lohse, K., Melis, A. P. & Tomasello, M. Young children share the spoils after collaboration. Psychol. Sci. 22, 267–273 (2011)

    Article  Google Scholar 

  21. 21

    Boesch, C. Cooperative hunting in wild chimpanzees. Anim. Behav. 48, 653–667 (1994)

    Article  Google Scholar 

  22. 22

    Lerner, M. J. The justice motive: “equity” and “parity” among children. J. Pers. Soc. Psychol. 29, 539–550 (1974)

    Article  Google Scholar 

  23. 23

    Damon, W. The Social World of the Child (Jossey-Bass, 1977)

    Google Scholar 

  24. 24

    Hook, J. G. & Cook, T. D. Equity theory and the cognitive ability of children. Psychol. Bull. 86, 429–445 (1979)

    Article  Google Scholar 

  25. 25

    Kienbaum, J. & Wilkening, F. Children’s and adolescents’ intuitive judgments about distributive justice: integrating need, effort, and luck. Eur. J. Dev. Psychol. 6, 481–498 (2009)

    Article  Google Scholar 

  26. 26

    Almås, I., Cappelen, A. W., Sørensen, E., Ø & Tungodden, B. Fairness and the development of inequality acceptance. Science 328, 1176–1178 (2010)

  27. 27

    Boehm, C. Impact of the human egalitarian syndrome on Darwinian selection mechanics. Am. Nat. 150, S100–S121 (1997)

    Article  Google Scholar 

  28. 28

    Kurzban, R. & Leary, M. R. Evolutionary origins of stigmatization: the functions of social exclusion. Psychol. Bull. 127, 187–208 (2001)

    CAS  Article  Google Scholar 

  29. 29

    Hirata, S. & Fuwa, K. Chimpanzees (Pan troglodytes) learn to act with other individuals in a cooperative task. Primates 48, 13–21 (2006)

    Article  Google Scholar 

  30. 30

    Melis, A. P., Hare, B. & Tomasello, M. Engineering cooperation in chimpanzees: tolerance constraints on cooperation. Anim. Behav. 72, 275–286 (2006)

    Article  Google Scholar 

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Acknowledgements

We thank all the children and day-care centres involved in this work for their cooperation, and we thank J. Dauksch, G. Duden, A. Gampe, I. Gavriliu, L. Hering, C. Markmann, M. Plötner, E. Rossi, A. Schrimpf, C. Weiske and the practical students at the Wolfgang Köhler Primate Research Center, Leipzig, for their help in recruiting children, data collection and behaviour coding. We also thank R. Pieszek and M. Ulrich for building the apparatuses, S. Tüpke and M. Sureck for creating the figures, R. Mundry for statistical advice and the zookeepers at Leipzig Zoo for their assistance with the chimpanzees. This work received funding from the EC Seventh Framework Program (FP7/2007-2013) under grant agreement no. 215805.

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K.H., F.W., J.R.G. and M.T. designed the study and wrote the paper. K.H. and J.R.G. conducted the studies and analysed the data. F.W. supervised the research.

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Correspondence to Katharina Hamann or Felix Warneken.

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The authors declare no competing financial interests.

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Supplementary Information

The file contains Supplementary Methods, Results and Data for 6 case studies, Supplementary Figures 1-6 with legends, Supplementary Table 1 and additional references. (PDF 543 kb)

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Hamann, K., Warneken, F., Greenberg, J. et al. Collaboration encourages equal sharing in children but not in chimpanzees. Nature 476, 328–331 (2011). https://doi.org/10.1038/nature10278

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