Cargando…

Grouping promotes both partnership and rivalry with long memory in direct reciprocity

Biological and social scientists have long been interested in understanding how to reconcile individual and collective interests in the iterated Prisoner’s Dilemma. Many effective strategies have been proposed, and they are often categorized into one of two classes, ‘partners’ and ‘rivals.’ More rec...

Descripción completa

Detalles Bibliográficos
Autores principales: Murase, Yohsuke, Baek, Seung Ki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10313083/
https://www.ncbi.nlm.nih.gov/pubmed/37339134
http://dx.doi.org/10.1371/journal.pcbi.1011228
_version_ 1785067048964980736
author Murase, Yohsuke
Baek, Seung Ki
author_facet Murase, Yohsuke
Baek, Seung Ki
author_sort Murase, Yohsuke
collection PubMed
description Biological and social scientists have long been interested in understanding how to reconcile individual and collective interests in the iterated Prisoner’s Dilemma. Many effective strategies have been proposed, and they are often categorized into one of two classes, ‘partners’ and ‘rivals.’ More recently, another class, ‘friendly rivals,’ has been identified in longer-memory strategy spaces. Friendly rivals qualify as both partners and rivals: They fully cooperate with themselves, like partners, but never allow their co-players to earn higher payoffs, like rivals. Although they have appealing theoretical properties, it is unclear whether they would emerge in an evolving population because most previous works focus on the memory-one strategy space, where no friendly rival strategy exists. To investigate this issue, we have conducted evolutionary simulations in well-mixed and group-structured populations and compared the evolutionary dynamics between memory-one and longer-memory strategy spaces. In a well-mixed population, the memory length does not make a major difference, and the key factors are the population size and the benefit of cooperation. Friendly rivals play a minor role because being a partner or a rival is often good enough in a given environment. It is in a group-structured population that memory length makes a stark difference: When longer-memory strategies are available, friendly rivals become dominant, and the cooperation level nearly reaches a maximum, even when the benefit of cooperation is so low that cooperation would not be achieved in a well-mixed population. This result highlights the important interaction between group structure and memory lengths that drive the evolution of cooperation.
format Online
Article
Text
id pubmed-10313083
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-103130832023-07-01 Grouping promotes both partnership and rivalry with long memory in direct reciprocity Murase, Yohsuke Baek, Seung Ki PLoS Comput Biol Research Article Biological and social scientists have long been interested in understanding how to reconcile individual and collective interests in the iterated Prisoner’s Dilemma. Many effective strategies have been proposed, and they are often categorized into one of two classes, ‘partners’ and ‘rivals.’ More recently, another class, ‘friendly rivals,’ has been identified in longer-memory strategy spaces. Friendly rivals qualify as both partners and rivals: They fully cooperate with themselves, like partners, but never allow their co-players to earn higher payoffs, like rivals. Although they have appealing theoretical properties, it is unclear whether they would emerge in an evolving population because most previous works focus on the memory-one strategy space, where no friendly rival strategy exists. To investigate this issue, we have conducted evolutionary simulations in well-mixed and group-structured populations and compared the evolutionary dynamics between memory-one and longer-memory strategy spaces. In a well-mixed population, the memory length does not make a major difference, and the key factors are the population size and the benefit of cooperation. Friendly rivals play a minor role because being a partner or a rival is often good enough in a given environment. It is in a group-structured population that memory length makes a stark difference: When longer-memory strategies are available, friendly rivals become dominant, and the cooperation level nearly reaches a maximum, even when the benefit of cooperation is so low that cooperation would not be achieved in a well-mixed population. This result highlights the important interaction between group structure and memory lengths that drive the evolution of cooperation. Public Library of Science 2023-06-20 /pmc/articles/PMC10313083/ /pubmed/37339134 http://dx.doi.org/10.1371/journal.pcbi.1011228 Text en © 2023 Murase, Baek https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Murase, Yohsuke
Baek, Seung Ki
Grouping promotes both partnership and rivalry with long memory in direct reciprocity
title Grouping promotes both partnership and rivalry with long memory in direct reciprocity
title_full Grouping promotes both partnership and rivalry with long memory in direct reciprocity
title_fullStr Grouping promotes both partnership and rivalry with long memory in direct reciprocity
title_full_unstemmed Grouping promotes both partnership and rivalry with long memory in direct reciprocity
title_short Grouping promotes both partnership and rivalry with long memory in direct reciprocity
title_sort grouping promotes both partnership and rivalry with long memory in direct reciprocity
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10313083/
https://www.ncbi.nlm.nih.gov/pubmed/37339134
http://dx.doi.org/10.1371/journal.pcbi.1011228
work_keys_str_mv AT muraseyohsuke groupingpromotesbothpartnershipandrivalrywithlongmemoryindirectreciprocity
AT baekseungki groupingpromotesbothpartnershipandrivalrywithlongmemoryindirectreciprocity