Roberts, G. et al. The benefits of being seen to help others: indirect reciprocity and reputation-based partner choice. Philos. Trans. R. Soc. B 376, 20200290 (2021).
Raihani, N. The Social Instinct: How Cooperation Shaped the World (Random House, 2021).
Alexander, R. D. The Biology of Moral Systems (Routledge, 2017).
Nowak, M. A. & Sigmund, K. Evolution of indirect reciprocity. Nature 437, 1291â1298 (2005).
Okada, I. A review of theoretical studies on indirect reciprocity. Games 11, 27 (2020).
Ohtsuki, H. & Iwasa, Y. How should we define goodness?âreputation dynamics in indirect reciprocity. J. Theor. Biol. 231, 107â120 (2004).
Hilbe, C., Schmid, L., Tkadlec, J., Chatterjee, K. & Nowak, M. A. Indirect reciprocity with private, noisy, and incomplete information. Proc. Natl Acad. Sci. USA 115, 12241â12246 (2018).
Berger, U. Learning to cooperate via indirect reciprocity. Games Econ. Behav. 72, 30â37 (2011).
Berger, U. & Grune, A. On the stability of cooperation under indirect reciprocity with first-order information. Games Econ. Behav. 98, 19â33 (2016).
Schmid, L., Ekbatani, F., Hilbe, C. & Chatterjee, K. Quantitative assessment can stabilize indirect reciprocity under imperfect information. Nat. Commun. 14, 2086 (2023).
Fujimoto, Y. & Ohtsuki, H. Evolutionary stability of cooperation in indirect reciprocity under noisy and private assessment. Proc. Natl Acad. Sci. USA 120, e2300544120 (2023).
Radzvilavicius, A. L., Stewart, A. J. & Plotkin, J. B. Evolution of empathetic moral evaluation. eLife 8, e44269 (2019).
Nakamaru, M. & Kawata, M. Evolution of rumours that discriminate lying defectors. Evol. Ecol. Res. 6, 261â283 (2004).
Sommerfeld, R. D., Krambeck, H.-J., Semmann, D. & Milinski, M. Gossip as an alternative for direct observation in games of indirect reciprocity. Proc. Natl Acad. Sci. USA 104, 17435â17440 (2007).
Seki, M. & Nakamaru, M. A model for gossip-mediated evolution of altruism with various types of false information by speakers and assessment by listeners. J. Theor. Biol. 407, 90â105 (2016).
Radzvilavicius, A. L., Kessinger, T. A. & Plotkin, J. B. Adherence to public institutions that foster cooperation. Nat. Commun. 12, 3567 (2021).
Iyengar, S., Lelkes, Y., Levendusky, M., Malhotra, N. & Westwood, S. J. The origins and consequences of affective polarization in the United States. Annu. Rev. Political Sci. 22, 129â146 (2019).
Newton, K. & Norris, P. in Disaffected Democracies: Whatâs Troubling the Trilateral Countries (eds Pharr, S. J. & Putnam, R. D.) 52â73 (Cambridge Univ. Press, 2000).
Public Trust in Government: 1958â2024. Pew Research Center www.pewresearch.org/politics/2024/06/24/public-trust-in-government-1958-2024/ (2024).
Boyd, R. & Richerson, P. J. The evolution of indirect reciprocity. Soc. Netw. 11, 213â236 (1989).
Nowak, M. A. & Sigmund, K. The dynamics of indirect reciprocity. J. Theor. Biol. 194, 561â574 (1998).
Manrique, H. M. et al. The psychological foundations of reputation-based cooperation. Philos. Trans. R. Soc. B 376, 20200287 (2021).
Panchanathan, K. & Boyd, R. A tale of two defectors: the importance of standing for evolution of indirect reciprocity. J. Theor. Biol. 224, 115â126 (2003).
Nowak, M. A. & Sigmund, K. Evolution of indirect reciprocity by image scoring. Nature 393, 573â577 (1998).
Wedekind, C. & Milinski, M. Cooperation through image scoring in humans. Science 288, 850â852 (2000).
Milinski, M., Semmann, D., Bakker, T. C. & Krambeck, H.-J. Cooperation through indirect reciprocity: image scoring or standing strategy? Proc. R. Soc. B: Biol. Sci. 268, 2495â2501 (2001).
Okada, I. Two ways to overcome the three social dilemmas of indirect reciprocity. Sci. Rep. 10, 16799 (2020).
Brandt, H. & Sigmund, K. The logic of reprobation: assessment and action rules for indirect reciprocation. J. Theor. Biol. 231, 475â486 (2004).
Santos, F. P., Santos, F. C. & Pacheco, J. M. Social norm complexity and past reputations in the evolution of cooperation. Nature 555, 242â245 (2018).
Raihani, N. J. & Bshary, R. The reputation of punishers. Trends Ecol. Evol. 30, 98â103 (2015).
Pacheco, J. M., Santos, F. C. & Chalub, F. A. C. Stern-judging: a simple, successful norm which promotes cooperation under indirect reciprocity. PLoS Comput. Biol. 2, e178 (2006).
Ohtsuki, H. & Iwasa, Y. The leading eight: social norms that can maintain cooperation by indirect reciprocity. J. Theor. Biol. 239, 435â444 (2006).
Takahashi, N. & Mashima, R. The importance of subjectivity in perceptual errors on the emergence of indirect reciprocity. J. Theor. Biol. 243, 418â436 (2006).
Uchida, S. & Sasaki, T. Effect of assessment error and private information on stern-judging in indirect reciprocity. Chaos Solitons Fractals 56, 175â180 (2013).
Uchida, S. Effect of private information on indirect reciprocity. Phys. Rev. E 82, 036111 (2010).
Nowak, M. A. Evolutionary Dynamics: Exploring the Equations of Life (Harvard Univ. Press, 2006).
Sasaki, T., Okada, I. & Nakai, Y. The evolution of conditional moral assessment in indirect reciprocity. Sci. Rep. 7, 41870 (2017).
Taylor, P. D. & Jonker, L. B. Evolutionary stable strategies and game dynamics. Math. Biosci. 40, 145â156 (1978).
Boyd, R. & Richerson, P. J. Culture and the Evolutionary Process (Univ. of Chicago Press, 1985).
Morin, O., Jacquet, P. O., Vaesen, K. & Acerbi, A. Social information use and social information waste. Philos. Trans. R. Soc. B 376, 20200052 (2021).
Henrich, J. & Gil-White, F. J. The evolution of prestige: freely conferred deference as a mechanism for enhancing the benefits of cultural transmission. Evol. Hum. Behav. 22, 165â196 (2001).
Kessinger, T. A., Tarnita, C. E. & Plotkin, J. B. Evolution of norms for judging social behavior. Proc. Natl Acad. Sci. USA 120, e2219480120 (2023).
Okada, I., Sasaki, T. & Nakai, Y. A solution for private assessment in indirect reciprocity using solitary observation. J. Theor. Biol. 455, 7â15 (2018).
Kandori, M. Social norms and community enforcement. Rev. Econ. Stud. 59, 63â80 (1992).
Santos, F. P., Pacheco, J. M. & Santos, F. C. Evolution of cooperation under indirect reciprocity and arbitrary exploration rates. Sci. Rep. 6, 37517 (2016).
Sugden, R. et al. The Economics of Rights, Co-operation and Welfare (Springer, 2004).
Perret, C., Krellner, M. & Han, T. A. The evolution of moral rules in a model of indirect reciprocity with private assessment. Sci. Rep. 11, 23581 (2021).
Axelrod, R. & Hamilton, W. D. The evolution of cooperation. Science 211, 1390â1396 (1981).
Michel-Mata, S. The evolution of private reputations in information-abundant landscapes. Zenodo https://doi.org/10.5281/zenodo.12795781 (2024).
