---
_id: '15006'
abstract:
- lang: eng
  text: Graphical games are a useful framework for modeling the interactions of (selfish)
    agents who are connected via an underlying topology and whose behaviors influence
    each other. They have wide applications ranging from computer science to economics
    and biology. Yet, even though an agent’s payoff only depends on the actions of
    their direct neighbors in graphical games, computing the Nash equilibria and making
    statements about the convergence time of "natural" local dynamics in particular
    can be highly challenging. In this work, we present a novel approach for classifying
    complexity of Nash equilibria in graphical games by establishing a connection
    to local graph algorithms, a subfield of distributed computing. In particular,
    we make the observation that the equilibria of graphical games are equivalent
    to locally verifiable labelings (LVL) in graphs; vertex labelings which are verifiable
    with constant-round local algorithms. This connection allows us to derive novel
    lower bounds on the convergence time to equilibrium of best-response dynamics
    in graphical games. Since we establish that distributed convergence can sometimes
    be provably slow, we also introduce and give bounds on an intuitive notion of
    "time-constrained" inefficiency of best responses. We exemplify how our results
    can be used in the implementation of mechanisms that ensure convergence of best
    responses to a Nash equilibrium. Our results thus also give insight into the convergence
    of strategy-proof algorithms for graphical games, which is still not well understood.
acknowledgement: This work was partially funded by the Academy of Finland, grant 314888,
  the European Research Council CoG 863818 (ForM-SMArt), and the Austrian Science
  Fund (FWF) project I 4800-N (ADVISE). LS was supported by the Stochastic Analysis
  and Application Research Center (SAARC) under National Research Foundation of Korea
  grant NRF-2019R1A5A1028324.
alternative_title:
- LIPIcs
article_number: '11'
article_processing_charge: No
arxiv: 1
author:
- first_name: Juho
  full_name: Hirvonen, Juho
  last_name: Hirvonen
- first_name: Laura
  full_name: Schmid, Laura
  id: 38B437DE-F248-11E8-B48F-1D18A9856A87
  last_name: Schmid
  orcid: 0000-0002-6978-7329
- first_name: Krishnendu
  full_name: Chatterjee, Krishnendu
  id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
  last_name: Chatterjee
  orcid: 0000-0002-4561-241X
- first_name: Stefan
  full_name: Schmid, Stefan
  last_name: Schmid
citation:
  ama: 'Hirvonen J, Schmid L, Chatterjee K, Schmid S. On the convergence time in graphical
    games: A locality-sensitive approach. In: <i>27th International Conference on
    Principles of Distributed Systems</i>. Vol 286. Schloss Dagstuhl - Leibniz-Zentrum
    für Informatik; 2024. doi:<a href="https://doi.org/10.4230/LIPIcs.OPODIS.2023.11">10.4230/LIPIcs.OPODIS.2023.11</a>'
  apa: 'Hirvonen, J., Schmid, L., Chatterjee, K., &#38; Schmid, S. (2024). On the
    convergence time in graphical games: A locality-sensitive approach. In <i>27th
    International Conference on Principles of Distributed Systems</i> (Vol. 286).
    Tokyo, Japan: Schloss Dagstuhl - Leibniz-Zentrum für Informatik. <a href="https://doi.org/10.4230/LIPIcs.OPODIS.2023.11">https://doi.org/10.4230/LIPIcs.OPODIS.2023.11</a>'
  chicago: 'Hirvonen, Juho, Laura Schmid, Krishnendu Chatterjee, and Stefan Schmid.
    “On the Convergence Time in Graphical Games: A Locality-Sensitive Approach.” In
    <i>27th International Conference on Principles of Distributed Systems</i>, Vol.
    286. Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2024. <a href="https://doi.org/10.4230/LIPIcs.OPODIS.2023.11">https://doi.org/10.4230/LIPIcs.OPODIS.2023.11</a>.'
  ieee: 'J. Hirvonen, L. Schmid, K. Chatterjee, and S. Schmid, “On the convergence
    time in graphical games: A locality-sensitive approach,” in <i>27th International
    Conference on Principles of Distributed Systems</i>, Tokyo, Japan, 2024, vol.
    286.'
  ista: 'Hirvonen J, Schmid L, Chatterjee K, Schmid S. 2024. On the convergence time
    in graphical games: A locality-sensitive approach. 27th International Conference
    on Principles of Distributed Systems. OPODIS: Conference on Principles of Distributed
    Systems, LIPIcs, vol. 286, 11.'
  mla: 'Hirvonen, Juho, et al. “On the Convergence Time in Graphical Games: A Locality-Sensitive
    Approach.” <i>27th International Conference on Principles of Distributed Systems</i>,
    vol. 286, 11, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2024, doi:<a
    href="https://doi.org/10.4230/LIPIcs.OPODIS.2023.11">10.4230/LIPIcs.OPODIS.2023.11</a>.'
  short: J. Hirvonen, L. Schmid, K. Chatterjee, S. Schmid, in:, 27th International
    Conference on Principles of Distributed Systems, Schloss Dagstuhl - Leibniz-Zentrum
    für Informatik, 2024.
conference:
  end_date: 2023-12-08
  location: Tokyo, Japan
  name: 'OPODIS: Conference on Principles of Distributed Systems'
  start_date: 2023-12-06
date_created: 2024-02-18T23:01:01Z
date_published: 2024-01-18T00:00:00Z
date_updated: 2025-07-14T09:10:03Z
day: '18'
ddc:
- '000'
department:
- _id: KrCh
doi: 10.4230/LIPIcs.OPODIS.2023.11
ec_funded: 1
external_id:
  arxiv:
  - '2102.13457'
file:
- access_level: open_access
  checksum: 4fc7eea6e4ba140b904781fc7df868ec
  content_type: application/pdf
  creator: dernst
  date_created: 2024-02-26T09:04:58Z
  date_updated: 2024-02-26T09:04:58Z
  file_id: '15028'
  file_name: 2024_LIPICs_Hirvonen.pdf
  file_size: 867363
  relation: main_file
  success: 1
file_date_updated: 2024-02-26T09:04:58Z
has_accepted_license: '1'
intvolume: '       286'
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
project:
- _id: 0599E47C-7A3F-11EA-A408-12923DDC885E
  call_identifier: H2020
  grant_number: '863818'
  name: 'Formal Methods for Stochastic Models: Algorithms and Applications'
publication: 27th International Conference on Principles of Distributed Systems
publication_identifier:
  isbn:
  - '9783959773089'
  issn:
  - '18688969'
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'On the convergence time in graphical games: A locality-sensitive approach'
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 286
year: '2024'
...
---
_id: '12861'
abstract:
- lang: eng
  text: The field of indirect reciprocity investigates how social norms can foster
    cooperation when individuals continuously monitor and assess each other’s social
    interactions. By adhering to certain social norms, cooperating individuals can
    improve their reputation and, in turn, receive benefits from others. Eight social
    norms, known as the “leading eight," have been shown to effectively promote the
    evolution of cooperation as long as information is public and reliable. These
    norms categorize group members as either ’good’ or ’bad’. In this study, we examine
    a scenario where individuals instead assign nuanced reputation scores to each
    other, and only cooperate with those whose reputation exceeds a certain threshold.
    We find both analytically and through simulations that such quantitative assessments
    are error-correcting, thus facilitating cooperation in situations where information
    is private and unreliable. Moreover, our results identify four specific norms
    that are robust to such conditions, and may be relevant for helping to sustain
    cooperation in natural populations.
acknowledgement: 'This work was supported by the European Research Council CoG 863818
  (ForM-SMArt) (to K.C.) and the European Research Council Starting Grant 850529:
  E-DIRECT (to C.H.). L.S. received additional partial support by the Austrian Science
  Fund (FWF) under grant Z211-N23 (Wittgenstein Award), and also thanks the support
  by the Stochastic Analysis and Application Research Center (SAARC) under National
  Research Foundation of Korea grant NRF-2019R1A5A1028324. The authors additionally
  thank Stefan Schmid for providing access to his lab infrastructure at the University
  of Vienna for the purpose of collecting simulation data.'
article_number: '2086'
article_processing_charge: No
article_type: original
author:
- first_name: Laura
  full_name: Schmid, Laura
  id: 38B437DE-F248-11E8-B48F-1D18A9856A87
  last_name: Schmid
  orcid: 0000-0002-6978-7329
- first_name: Farbod
  full_name: Ekbatani, Farbod
  last_name: Ekbatani
- first_name: Christian
  full_name: Hilbe, Christian
  id: 2FDF8F3C-F248-11E8-B48F-1D18A9856A87
  last_name: Hilbe
  orcid: 0000-0001-5116-955X
- first_name: Krishnendu
  full_name: Chatterjee, Krishnendu
  id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
  last_name: Chatterjee
  orcid: 0000-0002-4561-241X
citation:
  ama: Schmid L, Ekbatani F, Hilbe C, Chatterjee K. Quantitative assessment can stabilize
    indirect reciprocity under imperfect information. <i>Nature Communications</i>.
    2023;14. doi:<a href="https://doi.org/10.1038/s41467-023-37817-x">10.1038/s41467-023-37817-x</a>
  apa: Schmid, L., Ekbatani, F., Hilbe, C., &#38; Chatterjee, K. (2023). Quantitative
    assessment can stabilize indirect reciprocity under imperfect information. <i>Nature
    Communications</i>. Springer Nature. <a href="https://doi.org/10.1038/s41467-023-37817-x">https://doi.org/10.1038/s41467-023-37817-x</a>
  chicago: Schmid, Laura, Farbod Ekbatani, Christian Hilbe, and Krishnendu Chatterjee.
    “Quantitative Assessment Can Stabilize Indirect Reciprocity under Imperfect Information.”
    <i>Nature Communications</i>. Springer Nature, 2023. <a href="https://doi.org/10.1038/s41467-023-37817-x">https://doi.org/10.1038/s41467-023-37817-x</a>.
  ieee: L. Schmid, F. Ekbatani, C. Hilbe, and K. Chatterjee, “Quantitative assessment
    can stabilize indirect reciprocity under imperfect information,” <i>Nature Communications</i>,
    vol. 14. Springer Nature, 2023.
  ista: Schmid L, Ekbatani F, Hilbe C, Chatterjee K. 2023. Quantitative assessment
    can stabilize indirect reciprocity under imperfect information. Nature Communications.
    14, 2086.
  mla: Schmid, Laura, et al. “Quantitative Assessment Can Stabilize Indirect Reciprocity
    under Imperfect Information.” <i>Nature Communications</i>, vol. 14, 2086, Springer
    Nature, 2023, doi:<a href="https://doi.org/10.1038/s41467-023-37817-x">10.1038/s41467-023-37817-x</a>.
  short: L. Schmid, F. Ekbatani, C. Hilbe, K. Chatterjee, Nature Communications 14
    (2023).
date_created: 2023-04-23T22:01:03Z
date_published: 2023-04-12T00:00:00Z
date_updated: 2025-07-14T09:09:52Z
day: '12'
ddc:
- '000'
department:
- _id: KrCh
doi: 10.1038/s41467-023-37817-x
ec_funded: 1
external_id:
  isi:
  - '001003644100020'
  pmid:
  - '37045828'
file:
- access_level: open_access
  checksum: a4b3b7b36fbef068cabf4fb99501fef6
  content_type: application/pdf
  creator: dernst
  date_created: 2023-04-25T09:13:53Z
  date_updated: 2023-04-25T09:13:53Z
  file_id: '12868'
  file_name: 2023_NatureComm_Schmid.pdf
  file_size: 1786475
  relation: main_file
  success: 1
file_date_updated: 2023-04-25T09:13:53Z
has_accepted_license: '1'
intvolume: '        14'
isi: 1
language:
- iso: eng
month: '04'
oa: 1
oa_version: Published Version
pmid: 1
project:
- _id: 0599E47C-7A3F-11EA-A408-12923DDC885E
  call_identifier: H2020
  grant_number: '863818'
  name: 'Formal Methods for Stochastic Models: Algorithms and Applications'
- _id: 25F42A32-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: Z211
  name: The Wittgenstein Prize
publication: Nature Communications
publication_identifier:
  eissn:
  - 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Quantitative assessment can stabilize indirect reciprocity under imperfect
  information
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 14
year: '2023'
...
---
_id: '12280'
abstract:
- lang: eng
  text: 'In repeated interactions, players can use strategies that respond to the
    outcome of previous rounds. Much of the existing literature on direct reciprocity
    assumes that all competing individuals use the same strategy space. Here, we study
    both learning and evolutionary dynamics of players that differ in the strategy
    space they explore. We focus on the infinitely repeated donation game and compare
    three natural strategy spaces: memory-1 strategies, which consider the last moves
    of both players, reactive strategies, which respond to the last move of the co-player,
    and unconditional strategies. These three strategy spaces differ in the memory
    capacity that is needed. We compute the long term average payoff that is achieved
    in a pairwise learning process. We find that smaller strategy spaces can dominate
    larger ones. For weak selection, unconditional players dominate both reactive
    and memory-1 players. For intermediate selection, reactive players dominate memory-1
    players. Only for strong selection and low cost-to-benefit ratio, memory-1 players
    dominate the others. We observe that the supergame between strategy spaces can
    be a social dilemma: maximum payoff is achieved if both players explore a larger
    strategy space, but smaller strategy spaces dominate.'
acknowledgement: "This work was supported by the European Research Council (https://erc.europa.eu/)\r\nCoG
  863818 (ForM-SMArt) (to K.C.), and the European Research Council Starting Grant
  850529: E-DIRECT (to C.H.). The funders had no role in study design, data collection
  and analysis, decision to publish, or preparation of the manuscript."
article_number: e1010149
article_processing_charge: No
article_type: original
author:
- first_name: Laura
  full_name: Schmid, Laura
  id: 38B437DE-F248-11E8-B48F-1D18A9856A87
  last_name: Schmid
  orcid: 0000-0002-6978-7329
- first_name: Christian
  full_name: Hilbe, Christian
  id: 2FDF8F3C-F248-11E8-B48F-1D18A9856A87
  last_name: Hilbe
  orcid: 0000-0001-5116-955X
- first_name: Krishnendu
  full_name: Chatterjee, Krishnendu
  id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
  last_name: Chatterjee
  orcid: 0000-0002-4561-241X
- first_name: Martin
  full_name: Nowak, Martin
  last_name: Nowak
citation:
  ama: Schmid L, Hilbe C, Chatterjee K, Nowak M. Direct reciprocity between individuals
    that use different strategy spaces. <i>PLOS Computational Biology</i>. 2022;18(6).
    doi:<a href="https://doi.org/10.1371/journal.pcbi.1010149">10.1371/journal.pcbi.1010149</a>
  apa: Schmid, L., Hilbe, C., Chatterjee, K., &#38; Nowak, M. (2022). Direct reciprocity
    between individuals that use different strategy spaces. <i>PLOS Computational
    Biology</i>. Public Library of Science. <a href="https://doi.org/10.1371/journal.pcbi.1010149">https://doi.org/10.1371/journal.pcbi.1010149</a>
  chicago: Schmid, Laura, Christian Hilbe, Krishnendu Chatterjee, and Martin Nowak.
    “Direct Reciprocity between Individuals That Use Different Strategy Spaces.” <i>PLOS
    Computational Biology</i>. Public Library of Science, 2022. <a href="https://doi.org/10.1371/journal.pcbi.1010149">https://doi.org/10.1371/journal.pcbi.1010149</a>.
  ieee: L. Schmid, C. Hilbe, K. Chatterjee, and M. Nowak, “Direct reciprocity between
    individuals that use different strategy spaces,” <i>PLOS Computational Biology</i>,
    vol. 18, no. 6. Public Library of Science, 2022.
  ista: Schmid L, Hilbe C, Chatterjee K, Nowak M. 2022. Direct reciprocity between
    individuals that use different strategy spaces. PLOS Computational Biology. 18(6),
    e1010149.
  mla: Schmid, Laura, et al. “Direct Reciprocity between Individuals That Use Different
    Strategy Spaces.” <i>PLOS Computational Biology</i>, vol. 18, no. 6, e1010149,
    Public Library of Science, 2022, doi:<a href="https://doi.org/10.1371/journal.pcbi.1010149">10.1371/journal.pcbi.1010149</a>.
  short: L. Schmid, C. Hilbe, K. Chatterjee, M. Nowak, PLOS Computational Biology
    18 (2022).
date_created: 2023-01-16T10:02:51Z
date_published: 2022-06-14T00:00:00Z
date_updated: 2025-07-14T09:09:49Z
day: '14'
ddc:
- '000'
- '570'
department:
- _id: KrCh
doi: 10.1371/journal.pcbi.1010149
ec_funded: 1
external_id:
  isi:
  - '000843626800031'
  pmid:
  - '35700167'
file:
- access_level: open_access
  checksum: 31b6b311b6731f1658277a9dfff6632c
  content_type: application/pdf
  creator: dernst
  date_created: 2023-01-30T11:28:13Z
  date_updated: 2023-01-30T11:28:13Z
  file_id: '12460'
  file_name: 2022_PlosCompBio_Schmid.pdf
  file_size: 3143222
  relation: main_file
  success: 1
file_date_updated: 2023-01-30T11:28:13Z
has_accepted_license: '1'
intvolume: '        18'
isi: 1
issue: '6'
keyword:
- Computational Theory and Mathematics
- Cellular and Molecular Neuroscience
- Genetics
- Molecular Biology
- Ecology
- Modeling and Simulation
- Ecology
- Evolution
- Behavior and Systematics
language:
- iso: eng
month: '06'
oa: 1
oa_version: Published Version
pmid: 1
project:
- _id: 0599E47C-7A3F-11EA-A408-12923DDC885E
  call_identifier: H2020
  grant_number: '863818'
  name: 'Formal Methods for Stochastic Models: Algorithms and Applications'
publication: PLOS Computational Biology
publication_identifier:
  eissn:
  - 1553-7358
publication_status: published
publisher: Public Library of Science
quality_controlled: '1'
scopus_import: '1'
status: public
title: Direct reciprocity between individuals that use different strategy spaces
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 18
year: '2022'
...
---
_id: '9402'
abstract:
- lang: eng
  text: Direct and indirect reciprocity are key mechanisms for the evolution of cooperation.
    Direct reciprocity means that individuals use their own experience to decide whether
    to cooperate with another person. Indirect reciprocity means that they also consider
    the experiences of others. Although these two mechanisms are intertwined, they
    are typically studied in isolation. Here, we introduce a mathematical framework
    that allows us to explore both kinds of reciprocity simultaneously. We show that
    the well-known ‘generous tit-for-tat’ strategy of direct reciprocity has a natural
    analogue in indirect reciprocity, which we call ‘generous scoring’. Using an equilibrium
    analysis, we characterize under which conditions either of the two strategies
    can maintain cooperation. With simulations, we additionally explore which kind
    of reciprocity evolves when members of a population engage in social learning
    to adapt to their environment. Our results draw unexpected connections between
    direct and indirect reciprocity while highlighting important differences regarding
    their evolvability.
acknowledgement: 'This work was supported by the European Research Council CoG 863818
  (ForM-SMArt) (to K.C.), the European Research Council Start Grant 279307: Graph
  Games (to K.C.), and the European Research Council Starting Grant 850529: E-DIRECT
  (to C.H.). The funders had no role in study design, data collection and analysis,
  decision to publish or preparation of the manuscript.'
article_processing_charge: No
article_type: original
author:
- first_name: Laura
  full_name: Schmid, Laura
  id: 38B437DE-F248-11E8-B48F-1D18A9856A87
  last_name: Schmid
  orcid: 0000-0002-6978-7329
- first_name: Krishnendu
  full_name: Chatterjee, Krishnendu
  id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
  last_name: Chatterjee
  orcid: 0000-0002-4561-241X
- first_name: Christian
  full_name: Hilbe, Christian
  id: 2FDF8F3C-F248-11E8-B48F-1D18A9856A87
  last_name: Hilbe
  orcid: 0000-0001-5116-955X
- first_name: Martin A.
  full_name: Nowak, Martin A.
  last_name: Nowak
citation:
  ama: Schmid L, Chatterjee K, Hilbe C, Nowak MA. A unified framework of direct and
    indirect reciprocity. <i>Nature Human Behaviour</i>. 2021;5(10):1292–1302. doi:<a
    href="https://doi.org/10.1038/s41562-021-01114-8">10.1038/s41562-021-01114-8</a>
  apa: Schmid, L., Chatterjee, K., Hilbe, C., &#38; Nowak, M. A. (2021). A unified
    framework of direct and indirect reciprocity. <i>Nature Human Behaviour</i>. Springer
    Nature. <a href="https://doi.org/10.1038/s41562-021-01114-8">https://doi.org/10.1038/s41562-021-01114-8</a>
  chicago: Schmid, Laura, Krishnendu Chatterjee, Christian Hilbe, and Martin A. Nowak.
    “A Unified Framework of Direct and Indirect Reciprocity.” <i>Nature Human Behaviour</i>.
    Springer Nature, 2021. <a href="https://doi.org/10.1038/s41562-021-01114-8">https://doi.org/10.1038/s41562-021-01114-8</a>.
  ieee: L. Schmid, K. Chatterjee, C. Hilbe, and M. A. Nowak, “A unified framework
    of direct and indirect reciprocity,” <i>Nature Human Behaviour</i>, vol. 5, no.
    10. Springer Nature, pp. 1292–1302, 2021.
  ista: Schmid L, Chatterjee K, Hilbe C, Nowak MA. 2021. A unified framework of direct
    and indirect reciprocity. Nature Human Behaviour. 5(10), 1292–1302.
  mla: Schmid, Laura, et al. “A Unified Framework of Direct and Indirect Reciprocity.”
    <i>Nature Human Behaviour</i>, vol. 5, no. 10, Springer Nature, 2021, pp. 1292–1302,
    doi:<a href="https://doi.org/10.1038/s41562-021-01114-8">10.1038/s41562-021-01114-8</a>.
  short: L. Schmid, K. Chatterjee, C. Hilbe, M.A. Nowak, Nature Human Behaviour 5
    (2021) 1292–1302.
date_created: 2021-05-18T16:56:57Z
date_published: 2021-05-13T00:00:00Z
date_updated: 2025-07-14T09:10:09Z
day: '13'
ddc:
- '000'
department:
- _id: KrCh
- _id: GradSch
doi: 10.1038/s41562-021-01114-8
ec_funded: 1
external_id:
  isi:
  - '000650304000002'
  pmid:
  - '33986519'
file:
- access_level: open_access
  checksum: 34f55e173f90dc1dab731063458ac780
  content_type: application/pdf
  creator: dernst
  date_created: 2023-11-07T08:27:23Z
  date_updated: 2023-11-07T08:27:23Z
  file_id: '14496'
  file_name: 2021_NatureHumanBehaviour_Schmid_accepted.pdf
  file_size: 5232761
  relation: main_file
  success: 1
file_date_updated: 2023-11-07T08:27:23Z
has_accepted_license: '1'
intvolume: '         5'
isi: 1
issue: '10'
language:
- iso: eng
month: '05'
oa: 1
oa_version: Submitted Version
page: 1292–1302
pmid: 1
project:
- _id: 0599E47C-7A3F-11EA-A408-12923DDC885E
  call_identifier: H2020
  grant_number: '863818'
  name: 'Formal Methods for Stochastic Models: Algorithms and Applications'
- _id: 2581B60A-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '279307'
  name: 'Quantitative Graph Games: Theory and Applications'
publication: Nature Human Behaviour
publication_identifier:
  eissn:
  - 2397-3374
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
  link:
  - description: News on IST Homepage
    relation: press_release
    url: https://ist.ac.at/en/news/the-emergence-of-cooperation/
  record:
  - id: '10293'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: A unified framework of direct and indirect reciprocity
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5
year: '2021'
...
---
_id: '9403'
abstract:
- lang: eng
  text: Optimal decision making requires individuals to know their available options
    and to anticipate correctly what consequences these options have. In many social
    interactions, however, we refrain from gathering all relevant information, even
    if this information would help us make better decisions and is costless to obtain.
    This chapter examines several examples of “deliberate ignorance.” Two simple models
    are proposed to illustrate how ignorance can evolve among self-interested and
    payoff - maximizing individuals, and open problems are highlighted that lie ahead
    for future research to explore.
article_processing_charge: No
author:
- first_name: Laura
  full_name: Schmid, Laura
  id: 38B437DE-F248-11E8-B48F-1D18A9856A87
  last_name: Schmid
  orcid: 0000-0002-6978-7329
- first_name: Christian
  full_name: Hilbe, Christian
  last_name: Hilbe
citation:
  ama: 'Schmid L, Hilbe C. The evolution of strategic ignorance in strategic interaction.
    In: Hertwig R, Engel C, eds. <i>Deliberate Ignorance: Choosing Not To Know</i>.
    Vol 29. Strüngmann Forum Reports. MIT Press; 2021:139-152.'
  apa: 'Schmid, L., &#38; Hilbe, C. (2021). The evolution of strategic ignorance in
    strategic interaction. In R. Hertwig &#38; C. Engel (Eds.), <i>Deliberate Ignorance:
    Choosing Not To Know</i> (Vol. 29, pp. 139–152). MIT Press.'
  chicago: 'Schmid, Laura, and Christian Hilbe. “The Evolution of Strategic Ignorance
    in Strategic Interaction.” In <i>Deliberate Ignorance: Choosing Not To Know</i>,
    edited by Ralph Hertwig and Christoph Engel, 29:139–52. Strüngmann Forum Reports.
    MIT Press, 2021.'
  ieee: 'L. Schmid and C. Hilbe, “The evolution of strategic ignorance in strategic
    interaction,” in <i>Deliberate Ignorance: Choosing Not To Know</i>, vol. 29, R.
    Hertwig and C. Engel, Eds. MIT Press, 2021, pp. 139–152.'
  ista: 'Schmid L, Hilbe C. 2021.The evolution of strategic ignorance in strategic
    interaction. In: Deliberate Ignorance: Choosing Not To Know. vol. 29, 139–152.'
  mla: 'Schmid, Laura, and Christian Hilbe. “The Evolution of Strategic Ignorance
    in Strategic Interaction.” <i>Deliberate Ignorance: Choosing Not To Know</i>,
    edited by Ralph Hertwig and Christoph Engel, vol. 29, MIT Press, 2021, pp. 139–52.'
  short: 'L. Schmid, C. Hilbe, in:, R. Hertwig, C. Engel (Eds.), Deliberate Ignorance:
    Choosing Not To Know, MIT Press, 2021, pp. 139–152.'
date_created: 2021-05-19T12:25:42Z
date_published: 2021-03-01T00:00:00Z
date_updated: 2023-02-23T13:57:04Z
day: '01'
department:
- _id: GradSch
- _id: KrCh
editor:
- first_name: Ralph
  full_name: Hertwig, Ralph
  last_name: Hertwig
- first_name: Christoph
  full_name: Engel, Christoph
  last_name: Engel
intvolume: '        29'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://esforum.de/publications/PDFs/sfr29/SFR29_09_Hilbe%20and%20Schmid.pdf
month: '03'
oa: 1
oa_version: Published Version
page: 139-152
publication: 'Deliberate Ignorance: Choosing Not To Know'
publication_identifier:
  isbn:
  - 978-0-262-04559-9
publisher: MIT Press
quality_controlled: '1'
series_title: Strüngmann Forum Reports
status: public
title: The evolution of strategic ignorance in strategic interaction
type: book_chapter
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 29
year: '2021'
...
---
_id: '10293'
abstract:
- lang: eng
  text: "Indirect reciprocity in evolutionary game theory is a prominent mechanism
    for explaining the evolution of cooperation among unrelated individuals. In contrast
    to direct reciprocity, which is based on individuals meeting repeatedly, and conditionally
    cooperating by using their own experiences, indirect reciprocity is based on individuals’
    reputations. If a player helps another, this increases the helper’s public standing,
    benefitting them in the future. This lets cooperation in the population emerge
    without individuals having to meet more than once. While the two modes of reciprocity
    are intertwined, they are difficult to compare. Thus, they are usually studied
    in isolation. Direct reciprocity can maintain cooperation with simple strategies,
    and is robust against noise even when players do not remember more\r\nthan their
    partner’s last action. Meanwhile, indirect reciprocity requires its successful
    strategies, or social norms, to be more complex. Exhaustive search previously
    identified eight such norms, called the “leading eight”, which excel at maintaining
    cooperation. However, as the first result of this thesis, we show that the leading
    eight break down once we remove the fundamental assumption that information is
    synchronized and public, such that everyone agrees on reputations. Once we consider
    a more realistic scenario of imperfect information, where reputations are private,
    and individuals occasionally misinterpret or miss observations, the leading eight
    do not promote cooperation anymore. Instead, minor initial disagreements can proliferate,
    fragmenting populations into subgroups. In a next step, we consider ways to mitigate
    this issue. We first explore whether introducing “generosity” can stabilize cooperation
    when players use the leading eight strategies in noisy environments. This approach
    of modifying strategies to include probabilistic elements for coping with errors
    is known to work well in direct reciprocity. However, as we show here, it fails
    for the more complex norms of indirect reciprocity. Imperfect information still
    prevents cooperation from evolving. On the other hand, we succeeded to show in
    this thesis that modifying the leading eight to use “quantitative assessment”,
    i.e. tracking reputation scores on a scale beyond good and bad, and making overall
    judgments of others based on a threshold, is highly successful, even when noise
    increases in the environment. Cooperation can flourish when reputations\r\nare
    more nuanced, and players have a broader understanding what it means to be “good.”
    Finally, we present a single theoretical framework that unites the two modes of
    reciprocity despite their differences. Within this framework, we identify a novel
    simple and successful strategy for indirect reciprocity, which can cope with noisy
    environments and has an analogue in direct reciprocity. We can also analyze decision
    making when different sources of information are available. Our results help highlight
    that for sustaining cooperation, already the most simple rules of reciprocity
    can be sufficient."
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Laura
  full_name: Schmid, Laura
  id: 38B437DE-F248-11E8-B48F-1D18A9856A87
  last_name: Schmid
  orcid: 0000-0002-6978-7329
citation:
  ama: Schmid L. Evolution of cooperation via (in)direct reciprocity under imperfect
    information. 2021. doi:<a href="https://doi.org/10.15479/at:ista:10293">10.15479/at:ista:10293</a>
  apa: Schmid, L. (2021). <i>Evolution of cooperation via (in)direct reciprocity under
    imperfect information</i>. Institute of Science and Technology Austria. <a href="https://doi.org/10.15479/at:ista:10293">https://doi.org/10.15479/at:ista:10293</a>
  chicago: Schmid, Laura. “Evolution of Cooperation via (in)Direct Reciprocity under
    Imperfect Information.” Institute of Science and Technology Austria, 2021. <a
    href="https://doi.org/10.15479/at:ista:10293">https://doi.org/10.15479/at:ista:10293</a>.
  ieee: L. Schmid, “Evolution of cooperation via (in)direct reciprocity under imperfect
    information,” Institute of Science and Technology Austria, 2021.
  ista: Schmid L. 2021. Evolution of cooperation via (in)direct reciprocity under
    imperfect information. Institute of Science and Technology Austria.
  mla: Schmid, Laura. <i>Evolution of Cooperation via (in)Direct Reciprocity under
    Imperfect Information</i>. Institute of Science and Technology Austria, 2021,
    doi:<a href="https://doi.org/10.15479/at:ista:10293">10.15479/at:ista:10293</a>.
  short: L. Schmid, Evolution of Cooperation via (in)Direct Reciprocity under Imperfect
    Information, Institute of Science and Technology Austria, 2021.
date_created: 2021-11-15T17:12:57Z
date_published: 2021-11-17T00:00:00Z
date_updated: 2025-07-14T09:10:09Z
day: '17'
ddc:
- '519'
- '576'
degree_awarded: PhD
department:
- _id: GradSch
- _id: KrCh
doi: 10.15479/at:ista:10293
ec_funded: 1
file:
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file_date_updated: 2022-12-20T23:30:08Z
has_accepted_license: '1'
language:
- iso: eng
month: '11'
oa: 1
oa_version: Published Version
page: '171'
project:
- _id: 2581B60A-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '279307'
  name: 'Quantitative Graph Games: Theory and Applications'
- _id: 0599E47C-7A3F-11EA-A408-12923DDC885E
  call_identifier: H2020
  grant_number: '863818'
  name: 'Formal Methods for Stochastic Models: Algorithms and Applications'
- _id: 25F42A32-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: Z211
  name: The Wittgenstein Prize
- _id: 2584A770-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: P 23499-N23
  name: Modern Graph Algorithmic Techniques in Formal Verification
- _id: 25832EC2-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: S 11407_N23
  name: Rigorous Systems Engineering
publication_identifier:
  issn:
  - 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
  record:
  - id: '9997'
    relation: part_of_dissertation
    status: public
  - id: '2'
    relation: part_of_dissertation
    status: public
  - id: '9402'
    relation: part_of_dissertation
    status: public
status: public
supervisor:
- first_name: Krishnendu
  full_name: Chatterjee, Krishnendu
  id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
  last_name: Chatterjee
  orcid: 0000-0002-4561-241X
title: Evolution of cooperation via (in)direct reciprocity under imperfect information
type: dissertation
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
year: '2021'
...
---
_id: '9997'
abstract:
- lang: eng
  text: Indirect reciprocity is a mechanism for the evolution of cooperation based
    on social norms. This mechanism requires that individuals in a population observe
    and judge each other’s behaviors. Individuals with a good reputation are more
    likely to receive help from others. Previous work suggests that indirect reciprocity
    is only effective when all relevant information is reliable and publicly available.
    Otherwise, individuals may disagree on how to assess others, even if they all
    apply the same social norm. Such disagreements can lead to a breakdown of cooperation.
    Here we explore whether the predominantly studied ‘leading eight’ social norms
    of indirect reciprocity can be made more robust by equipping them with an element
    of generosity. To this end, we distinguish between two kinds of generosity. According
    to assessment generosity, individuals occasionally assign a good reputation to
    group members who would usually be regarded as bad. According to action generosity,
    individuals occasionally cooperate with group members with whom they would usually
    defect. Using individual-based simulations, we show that the two kinds of generosity
    have a very different effect on the resulting reputation dynamics. Assessment
    generosity tends to add to the overall noise and allows defectors to invade. In
    contrast, a limited amount of action generosity can be beneficial in a few cases.
    However, even when action generosity is beneficial, the respective simulations
    do not result in full cooperation. Our results suggest that while generosity can
    favor cooperation when individuals use the most simple strategies of reciprocity,
    it is disadvantageous when individuals use more complex social norms.
acknowledgement: 'This work was supported by the European Research Council CoG 863818
  (ForM-SMArt) (to K.C.) and the European Research Council Starting Grant 850529:
  E-DIRECT (to C.H.). L.S. received additional partial support by the Austrian Science
  Fund (FWF) under Grant Z211-N23 (Wittgenstein Award).'
article_number: '17443'
article_processing_charge: Yes
article_type: original
author:
- first_name: Laura
  full_name: Schmid, Laura
  id: 38B437DE-F248-11E8-B48F-1D18A9856A87
  last_name: Schmid
  orcid: 0000-0002-6978-7329
- first_name: Pouya
  full_name: Shati, Pouya
  last_name: Shati
- first_name: Christian
  full_name: Hilbe, Christian
  last_name: Hilbe
- first_name: Krishnendu
  full_name: Chatterjee, Krishnendu
  id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
  last_name: Chatterjee
  orcid: 0000-0002-4561-241X
citation:
  ama: Schmid L, Shati P, Hilbe C, Chatterjee K. The evolution of indirect reciprocity
    under action and assessment generosity. <i>Scientific Reports</i>. 2021;11(1).
    doi:<a href="https://doi.org/10.1038/s41598-021-96932-1">10.1038/s41598-021-96932-1</a>
  apa: Schmid, L., Shati, P., Hilbe, C., &#38; Chatterjee, K. (2021). The evolution
    of indirect reciprocity under action and assessment generosity. <i>Scientific
    Reports</i>. Springer Nature. <a href="https://doi.org/10.1038/s41598-021-96932-1">https://doi.org/10.1038/s41598-021-96932-1</a>
  chicago: Schmid, Laura, Pouya Shati, Christian Hilbe, and Krishnendu Chatterjee.
    “The Evolution of Indirect Reciprocity under Action and Assessment Generosity.”
    <i>Scientific Reports</i>. Springer Nature, 2021. <a href="https://doi.org/10.1038/s41598-021-96932-1">https://doi.org/10.1038/s41598-021-96932-1</a>.
  ieee: L. Schmid, P. Shati, C. Hilbe, and K. Chatterjee, “The evolution of indirect
    reciprocity under action and assessment generosity,” <i>Scientific Reports</i>,
    vol. 11, no. 1. Springer Nature, 2021.
  ista: Schmid L, Shati P, Hilbe C, Chatterjee K. 2021. The evolution of indirect
    reciprocity under action and assessment generosity. Scientific Reports. 11(1),
    17443.
  mla: Schmid, Laura, et al. “The Evolution of Indirect Reciprocity under Action and
    Assessment Generosity.” <i>Scientific Reports</i>, vol. 11, no. 1, 17443, Springer
    Nature, 2021, doi:<a href="https://doi.org/10.1038/s41598-021-96932-1">10.1038/s41598-021-96932-1</a>.
  short: L. Schmid, P. Shati, C. Hilbe, K. Chatterjee, Scientific Reports 11 (2021).
date_created: 2021-09-11T16:22:02Z
date_published: 2021-08-31T00:00:00Z
date_updated: 2025-07-14T09:10:09Z
day: '31'
ddc:
- '003'
department:
- _id: GradSch
- _id: KrCh
doi: 10.1038/s41598-021-96932-1
ec_funded: 1
external_id:
  isi:
  - '000692406400018'
  pmid:
  - '34465830'
file:
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  checksum: 19df8816cf958b272b85841565c73182
  content_type: application/pdf
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  date_created: 2021-09-13T10:31:21Z
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  file_id: '10006'
  file_name: 2021_ScientificReports_Schmid.pdf
  file_size: 2424943
  relation: main_file
  success: 1
file_date_updated: 2021-09-13T10:31:21Z
has_accepted_license: '1'
intvolume: '        11'
isi: 1
issue: '1'
keyword:
- Multidisciplinary
language:
- iso: eng
month: '08'
oa: 1
oa_version: Published Version
pmid: 1
project:
- _id: 0599E47C-7A3F-11EA-A408-12923DDC885E
  call_identifier: H2020
  grant_number: '863818'
  name: 'Formal Methods for Stochastic Models: Algorithms and Applications'
- _id: 25F42A32-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: Z211
  name: The Wittgenstein Prize
publication: Scientific Reports
publication_identifier:
  eissn:
  - 2045-2322
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
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    relation: dissertation_contains
    status: public
status: public
title: The evolution of indirect reciprocity under action and assessment generosity
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
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type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 11
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...
---
_id: '7346'
abstract:
- lang: eng
  text: 'The Price of Anarchy (PoA) is a well-established game-theoretic concept to
    shed light on coordination issues arising in open distributed systems. Leaving
    agents to selfishly optimize comes with the risk of ending up in sub-optimal states
    (in terms of performance and/or costs), compared to a centralized system design.
    However, the PoA relies on strong assumptions about agents'' rationality (e.g.,
    resources and information) and interactions, whereas in many distributed systems
    agents interact locally with bounded resources. They do so repeatedly over time
    (in contrast to "one-shot games"), and their strategies may evolve. Using a more
    realistic evolutionary game model, this paper introduces a realized evolutionary
    Price of Anarchy (ePoA). The ePoA allows an exploration of equilibrium selection
    in dynamic distributed systems with multiple equilibria, based on local interactions
    of simple memoryless agents. Considering a fundamental game related to virus propagation
    on networks, we present analytical bounds on the ePoA in basic network topologies
    and for different strategy update dynamics. In particular, deriving stationary
    distributions of the stochastic evolutionary process, we find that the Nash equilibria
    are not always the most abundant states, and that different processes can feature
    significant off-equilibrium behavior, leading to a significantly higher ePoA compared
    to the PoA studied traditionally in the literature. '
alternative_title:
- LIPIcs
article_number: '21'
article_processing_charge: No
arxiv: 1
author:
- first_name: Laura
  full_name: Schmid, Laura
  id: 38B437DE-F248-11E8-B48F-1D18A9856A87
  last_name: Schmid
  orcid: 0000-0002-6978-7329
- first_name: Krishnendu
  full_name: Chatterjee, Krishnendu
  id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
  last_name: Chatterjee
  orcid: 0000-0002-4561-241X
- first_name: Stefan
  full_name: Schmid, Stefan
  last_name: Schmid
citation:
  ama: 'Schmid L, Chatterjee K, Schmid S. The evolutionary price of anarchy: Locally
    bounded agents in a dynamic virus game. In: <i>Proceedings of the 23rd International
    Conference on Principles of Distributed Systems</i>. Vol 153. Schloss Dagstuhl
    - Leibniz-Zentrum für Informatik; 2020. doi:<a href="https://doi.org/10.4230/LIPIcs.OPODIS.2019.21">10.4230/LIPIcs.OPODIS.2019.21</a>'
  apa: 'Schmid, L., Chatterjee, K., &#38; Schmid, S. (2020). The evolutionary price
    of anarchy: Locally bounded agents in a dynamic virus game. In <i>Proceedings
    of the 23rd International Conference on Principles of Distributed Systems</i>
    (Vol. 153). Neuchâtel, Switzerland: Schloss Dagstuhl - Leibniz-Zentrum für Informatik.
    <a href="https://doi.org/10.4230/LIPIcs.OPODIS.2019.21">https://doi.org/10.4230/LIPIcs.OPODIS.2019.21</a>'
  chicago: 'Schmid, Laura, Krishnendu Chatterjee, and Stefan Schmid. “The Evolutionary
    Price of Anarchy: Locally Bounded Agents in a Dynamic Virus Game.” In <i>Proceedings
    of the 23rd International Conference on Principles of Distributed Systems</i>,
    Vol. 153. Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2020. <a href="https://doi.org/10.4230/LIPIcs.OPODIS.2019.21">https://doi.org/10.4230/LIPIcs.OPODIS.2019.21</a>.'
  ieee: 'L. Schmid, K. Chatterjee, and S. Schmid, “The evolutionary price of anarchy:
    Locally bounded agents in a dynamic virus game,” in <i>Proceedings of the 23rd
    International Conference on Principles of Distributed Systems</i>, Neuchâtel,
    Switzerland, 2020, vol. 153.'
  ista: 'Schmid L, Chatterjee K, Schmid S. 2020. The evolutionary price of anarchy:
    Locally bounded agents in a dynamic virus game. Proceedings of the 23rd International
    Conference on Principles of Distributed Systems. OPODIS: International Conference
    on Principles of Distributed Systems, LIPIcs, vol. 153, 21.'
  mla: 'Schmid, Laura, et al. “The Evolutionary Price of Anarchy: Locally Bounded
    Agents in a Dynamic Virus Game.” <i>Proceedings of the 23rd International Conference
    on Principles of Distributed Systems</i>, vol. 153, 21, Schloss Dagstuhl - Leibniz-Zentrum
    für Informatik, 2020, doi:<a href="https://doi.org/10.4230/LIPIcs.OPODIS.2019.21">10.4230/LIPIcs.OPODIS.2019.21</a>.'
  short: L. Schmid, K. Chatterjee, S. Schmid, in:, Proceedings of the 23rd International
    Conference on Principles of Distributed Systems, Schloss Dagstuhl - Leibniz-Zentrum
    für Informatik, 2020.
conference:
  end_date: 2019-12-19
  location: Neuchâtel, Switzerland
  name: 'OPODIS: International Conference on Principles of Distributed Systems'
  start_date: 2019-12-17
date_created: 2020-01-21T16:00:26Z
date_published: 2020-02-10T00:00:00Z
date_updated: 2023-02-23T13:05:49Z
day: '10'
ddc:
- '000'
department:
- _id: KrCh
doi: 10.4230/LIPIcs.OPODIS.2019.21
external_id:
  arxiv:
  - '1906.00110'
file:
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  date_created: 2020-03-23T09:14:06Z
  date_updated: 2020-07-14T12:47:56Z
  file_id: '7608'
  file_name: 2019_LIPIcS_Schmid.pdf
  file_size: 630752
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file_date_updated: 2020-07-14T12:47:56Z
has_accepted_license: '1'
intvolume: '       153'
language:
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month: '02'
oa: 1
oa_version: Preprint
project:
- _id: 25832EC2-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: S 11407_N23
  name: Rigorous Systems Engineering
publication: Proceedings of the 23rd International Conference on Principles of Distributed
  Systems
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'The evolutionary price of anarchy: Locally bounded agents in a dynamic virus
  game'
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: conference
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 153
year: '2020'
...
---
_id: '2'
abstract:
- lang: eng
  text: Indirect reciprocity explores how humans act when their reputation is at stake,
    and which social norms they use to assess the actions of others. A crucial question
    in indirect reciprocity is which social norms can maintain stable cooperation
    in a society. Past research has highlighted eight such norms, called “leading-eight”
    strategies. This past research, however, is based on the assumption that all relevant
    information about other population members is publicly available and that everyone
    agrees on who is good or bad. Instead, here we explore the reputation dynamics
    when information is private and noisy. We show that under these conditions, most
    leading-eight strategies fail to evolve. Those leading-eight strategies that do
    evolve are unable to sustain full cooperation.Indirect reciprocity is a mechanism
    for cooperation based on shared moral systems and individual reputations. It assumes
    that members of a community routinely observe and assess each other and that they
    use this information to decide who is good or bad, and who deserves cooperation.
    When information is transmitted publicly, such that all community members agree
    on each other’s reputation, previous research has highlighted eight crucial moral
    systems. These “leading-eight” strategies can maintain cooperation and resist
    invasion by defectors. However, in real populations individuals often hold their
    own private views of others. Once two individuals disagree about their opinion
    of some third party, they may also see its subsequent actions in a different light.
    Their opinions may further diverge over time. Herein, we explore indirect reciprocity
    when information transmission is private and noisy. We find that in the presence
    of perception errors, most leading-eight strategies cease to be stable. Even if
    a leading-eight strategy evolves, cooperation rates may drop considerably when
    errors are common. Our research highlights the role of reliable information and
    synchronized reputations to maintain stable moral systems.
article_processing_charge: No
author:
- first_name: Christian
  full_name: Hilbe, Christian
  id: 2FDF8F3C-F248-11E8-B48F-1D18A9856A87
  last_name: Hilbe
  orcid: 0000-0001-5116-955X
- first_name: Laura
  full_name: Schmid, Laura
  id: 38B437DE-F248-11E8-B48F-1D18A9856A87
  last_name: Schmid
  orcid: 0000-0002-6978-7329
- first_name: Josef
  full_name: Tkadlec, Josef
  id: 3F24CCC8-F248-11E8-B48F-1D18A9856A87
  last_name: Tkadlec
  orcid: 0000-0002-1097-9684
- first_name: Krishnendu
  full_name: Chatterjee, Krishnendu
  id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
  last_name: Chatterjee
  orcid: 0000-0002-4561-241X
- first_name: Martin
  full_name: Nowak, Martin
  last_name: Nowak
citation:
  ama: Hilbe C, Schmid L, Tkadlec J, Chatterjee K, Nowak M. Indirect reciprocity with
    private, noisy, and incomplete information. <i>PNAS</i>. 2018;115(48):12241-12246.
    doi:<a href="https://doi.org/10.1073/pnas.1810565115">10.1073/pnas.1810565115</a>
  apa: Hilbe, C., Schmid, L., Tkadlec, J., Chatterjee, K., &#38; Nowak, M. (2018).
    Indirect reciprocity with private, noisy, and incomplete information. <i>PNAS</i>.
    National Academy of Sciences. <a href="https://doi.org/10.1073/pnas.1810565115">https://doi.org/10.1073/pnas.1810565115</a>
  chicago: Hilbe, Christian, Laura Schmid, Josef Tkadlec, Krishnendu Chatterjee, and
    Martin Nowak. “Indirect Reciprocity with Private, Noisy, and Incomplete Information.”
    <i>PNAS</i>. National Academy of Sciences, 2018. <a href="https://doi.org/10.1073/pnas.1810565115">https://doi.org/10.1073/pnas.1810565115</a>.
  ieee: C. Hilbe, L. Schmid, J. Tkadlec, K. Chatterjee, and M. Nowak, “Indirect reciprocity
    with private, noisy, and incomplete information,” <i>PNAS</i>, vol. 115, no. 48.
    National Academy of Sciences, pp. 12241–12246, 2018.
  ista: Hilbe C, Schmid L, Tkadlec J, Chatterjee K, Nowak M. 2018. Indirect reciprocity
    with private, noisy, and incomplete information. PNAS. 115(48), 12241–12246.
  mla: Hilbe, Christian, et al. “Indirect Reciprocity with Private, Noisy, and Incomplete
    Information.” <i>PNAS</i>, vol. 115, no. 48, National Academy of Sciences, 2018,
    pp. 12241–46, doi:<a href="https://doi.org/10.1073/pnas.1810565115">10.1073/pnas.1810565115</a>.
  short: C. Hilbe, L. Schmid, J. Tkadlec, K. Chatterjee, M. Nowak, PNAS 115 (2018)
    12241–12246.
date_created: 2018-12-11T11:44:05Z
date_published: 2018-11-27T00:00:00Z
date_updated: 2025-07-14T09:10:09Z
day: '27'
department:
- _id: KrCh
doi: 10.1073/pnas.1810565115
ec_funded: 1
external_id:
  isi:
  - '000451351000063'
  pmid:
  - '30429320'
intvolume: '       115'
isi: 1
issue: '48'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://www.ncbi.nlm.nih.gov/pubmed/30429320
month: '11'
oa: 1
oa_version: Submitted Version
page: 12241-12246
pmid: 1
project:
- _id: 2581B60A-B435-11E9-9278-68D0E5697425
  call_identifier: FP7
  grant_number: '279307'
  name: 'Quantitative Graph Games: Theory and Applications'
- _id: 2584A770-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: P 23499-N23
  name: Modern Graph Algorithmic Techniques in Formal Verification
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  call_identifier: FWF
  grant_number: S 11407_N23
  name: Rigorous Systems Engineering
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  call_identifier: FP7
  grant_number: '291734'
  name: International IST Postdoc Fellowship Programme
publication: PNAS
publication_status: published
publisher: National Academy of Sciences
quality_controlled: '1'
related_material:
  link:
  - description: News on IST Homepage
    relation: press_release
    url: https://ist.ac.at/en/news/no-cooperation-without-open-communication/
  record:
  - id: '10293'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: Indirect reciprocity with private, noisy, and incomplete information
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 115
year: '2018'
...
