---
OA_place: publisher
OA_type: gold
_id: '21411'
abstract:
- lang: eng
  text: "To achieve fast recovery from link failures, most modern communication networks
    feature fully\r\ndecentralized fast re-routing mechanisms. These re-routing mechanisms
    rely on pre-installed static re-routing rules at the nodes (the routers), which
    depend only on local failure information, namely on the failed links incident
    to the node. Ideally, a network is perfectly resilient: the re-routing rules ensure
    that packets are always successfully routed to their destinations as long as the
    source and the destination are still physically connected in the underlying network
    after the failures. Unfortunately, there are examples where achieving perfect
    resilience is not possible. Surprisingly, only very little is known about the
    algorithmic aspect of when and how perfect resilience can be achieved. We investigate
    the computational complexity of analyzing such local fast re-routing mechanisms.
    Our main result is a negative one: we show that even checking whether a given
    set of static re-routing rules ensures perfect resilience is coNP-complete. Additionally,
    we investigate other fundamental variations of the problem. In particular, we
    show that our coNP-completeness proof also applies to scenarios where the re-routing
    rules have specific patterns (known as skipping in the literature). On the positive
    side, for scenarios where nodes do not have information about the link from which
    a packet arrived (the so-called in-port), we present a linear-time algorithm to
    realize perfect resilience whenever possible (which we show can also be determined
    in linear time). "
acknowledgement: "Matthias Bentert: ERC Horizon 2020 research and innovation programme
  (grant agreement\r\nNo. 819416) and ERC Consolidator grant AdjustNet (agreement
  No. 864228).\r\nEsra Ceylan: German Research Foundation (DFG) project ReNO, Schwerpunktprogramm:\r\nResilienz
  in Vernetzten Welten – Beherrschen von Fehlern, Überlast, Angriffen und dem\r\nUnbekannten
  (SPP 2378).\r\nStefan Schmid: German Research Foundation (DFG) project ReNO, Schwerpunktprogramm:\r\nResilienz
  in Vernetzten Welten – Beherrschen von Fehlern, Überlast, Angriffen und dem\r\nUnbekannten
  (SPP 2378)."
alternative_title:
- LIPIcs
article_number: '31'
article_processing_charge: No
author:
- first_name: Matthias
  full_name: Bentert, Matthias
  last_name: Bentert
- first_name: Esra
  full_name: Ceylan, Esra
  last_name: Ceylan
- first_name: Valentin
  full_name: Hübner, Valentin
  id: 2c8aa207-dc7d-11ea-9b2f-f22972ecd910
  last_name: Hübner
  orcid: 0009-0001-5009-4987
- first_name: Stefan
  full_name: Schmid, Stefan
  last_name: Schmid
- first_name: Jiří
  full_name: Srba, Jiří
  last_name: Srba
citation:
  ama: 'Bentert M, Ceylan E, Hübner V, Schmid S, Srba J. Fast re-routing in networks:
    On the complexity of perfect resilience. In: <i>29th International Conference
    on Principles of Distributed Systems</i>. Vol 361. Schloss Dagstuhl - Leibniz-Zentrum
    für Informatik; 2026. doi:<a href="https://doi.org/10.4230/LIPIcs.OPODIS.2025.31">10.4230/LIPIcs.OPODIS.2025.31</a>'
  apa: 'Bentert, M., Ceylan, E., Hübner, V., Schmid, S., &#38; Srba, J. (2026). Fast
    re-routing in networks: On the complexity of perfect resilience. In <i>29th International
    Conference on Principles of Distributed Systems</i> (Vol. 361). Iaşi, Romania:
    Schloss Dagstuhl - Leibniz-Zentrum für Informatik. <a href="https://doi.org/10.4230/LIPIcs.OPODIS.2025.31">https://doi.org/10.4230/LIPIcs.OPODIS.2025.31</a>'
  chicago: 'Bentert, Matthias, Esra Ceylan, Valentin Hübner, Stefan Schmid, and Jiří
    Srba. “Fast Re-Routing in Networks: On the Complexity of Perfect Resilience.”
    In <i>29th International Conference on Principles of Distributed Systems</i>,
    Vol. 361. Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2026. <a href="https://doi.org/10.4230/LIPIcs.OPODIS.2025.31">https://doi.org/10.4230/LIPIcs.OPODIS.2025.31</a>.'
  ieee: 'M. Bentert, E. Ceylan, V. Hübner, S. Schmid, and J. Srba, “Fast re-routing
    in networks: On the complexity of perfect resilience,” in <i>29th International
    Conference on Principles of Distributed Systems</i>, Iaşi, Romania, 2026, vol.
    361.'
  ista: 'Bentert M, Ceylan E, Hübner V, Schmid S, Srba J. 2026. Fast re-routing in
    networks: On the complexity of perfect resilience. 29th International Conference
    on Principles of Distributed Systems. OPODIS: Conference on Principles of Distributed
    Systems, LIPIcs, vol. 361, 31.'
  mla: 'Bentert, Matthias, et al. “Fast Re-Routing in Networks: On the Complexity
    of Perfect Resilience.” <i>29th International Conference on Principles of Distributed
    Systems</i>, vol. 361, 31, Schloss Dagstuhl - Leibniz-Zentrum für Informatik,
    2026, doi:<a href="https://doi.org/10.4230/LIPIcs.OPODIS.2025.31">10.4230/LIPIcs.OPODIS.2025.31</a>.'
  short: M. Bentert, E. Ceylan, V. Hübner, S. Schmid, J. Srba, in:, 29th International
    Conference on Principles of Distributed Systems, Schloss Dagstuhl - Leibniz-Zentrum
    für Informatik, 2026.
conference:
  end_date: 2025-12-05
  location: Iaşi, Romania
  name: 'OPODIS: Conference on Principles of Distributed Systems'
  start_date: 2025-12-03
date_created: 2026-03-08T23:01:46Z
date_published: 2026-01-07T00:00:00Z
date_updated: 2026-03-09T12:36:11Z
day: '07'
ddc:
- '000'
department:
- _id: KrCh
doi: 10.4230/LIPIcs.OPODIS.2025.31
file:
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  date_updated: 2026-03-09T12:33:58Z
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  relation: main_file
  success: 1
file_date_updated: 2026-03-09T12:33:58Z
fulldoi: https://doi.org/10.4230/LIPIcs.OPODIS.2025.31
has_accepted_license: '1'
intvolume: '       361'
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
publication: 29th International Conference on Principles of Distributed Systems
publication_identifier:
  eissn:
  - 1868-8969
  isbn:
  - '9783959774093'
publication_status: published
publisher: Schloss Dagstuhl - Leibniz-Zentrum für Informatik
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Fast re-routing in networks: On the complexity of perfect resilience'
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: 361
year: '2026'
...
---
OA_place: publisher
OA_type: hybrid
PlanS_conform: '1'
_id: '19074'
abstract:
- lang: eng
  text: 'The public goods game is among the most studied metaphors of cooperation
    in groups. In this game, individuals can use their endowments to make contributions
    towards a good that benefits everyone. Each individual, however, is tempted to
    free-ride on the contributions of others. Herein, we study repeated public goods
    games among asymmetric players. Previous work has explored to which extent asymmetry
    allows for full cooperation, such that players contribute their full endowment
    each round. However, by design that work focusses on equilibria where individuals
    make the same contribution each round. Instead, here we consider players whose
    contributions along the equilibrium path can change from one round to the next.
    We do so for three different models – one without any budget constraints, one
    with endowment constraints, and one in which individuals can save their current
    endowment to be used in subsequent rounds. In each case, we explore two key quantities:
    the welfare and the resource efficiency that can be achieved in equilibrium. Welfare
    corresponds to the sum of all players’ payoffs. Resource efficiency relates this
    welfare to the total contributions made by the players. Compared to constant contribution
    sequences, we find that time-dependent contributions can improve resource efficiency
    across all three models. Moreover, they can improve the players’ welfare in the
    model with savings.'
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.), the European Union’s Horizon 2020 research and innovation programme
  under the Marie Skłodowska-Curie Grant Agreement #754411 and the French Agence Nationale
  de la Recherche (under the Investissement d’Avenir programme, ANR-17-EURE-0010),
  and ARC SRIEAS Grant SR200100005 Securing Antarctica’s Environmental Future (to
  M.K.). Open access funding provided by Institute of Science and Technology (IST
  Austria).'
article_processing_charge: Yes (via OA deal)
article_type: original
author:
- first_name: Valentin
  full_name: Hübner, Valentin
  id: 2c8aa207-dc7d-11ea-9b2f-f22972ecd910
  last_name: Hübner
  orcid: 0009-0001-5009-4987
- first_name: Christian
  full_name: Hilbe, Christian
  id: 2FDF8F3C-F248-11E8-B48F-1D18A9856A87
  last_name: Hilbe
  orcid: 0000-0001-5116-955X
- first_name: Manuel
  full_name: Staab, Manuel
  last_name: Staab
- first_name: Maria
  full_name: Kleshnina, Maria
  id: 4E21749C-F248-11E8-B48F-1D18A9856A87
  last_name: Kleshnina
  orcid: 0000-0002-5518-8317
- first_name: Krishnendu
  full_name: Chatterjee, Krishnendu
  id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
  last_name: Chatterjee
  orcid: 0000-0002-4561-241X
citation:
  ama: Hübner V, Hilbe C, Staab M, Kleshnina M, Chatterjee K. Time-dependent strategies
    in repeated asymmetric public goods games. <i>Dynamic Games and Applications</i>.
    2025;15:1617-1645. doi:<a href="https://doi.org/10.1007/s13235-025-00627-5">10.1007/s13235-025-00627-5</a>
  apa: Hübner, V., Hilbe, C., Staab, M., Kleshnina, M., &#38; Chatterjee, K. (2025).
    Time-dependent strategies in repeated asymmetric public goods games. <i>Dynamic
    Games and Applications</i>. Springer Nature. <a href="https://doi.org/10.1007/s13235-025-00627-5">https://doi.org/10.1007/s13235-025-00627-5</a>
  chicago: Hübner, Valentin, Christian Hilbe, Manuel Staab, Maria Kleshnina, and Krishnendu
    Chatterjee. “Time-Dependent Strategies in Repeated Asymmetric Public Goods Games.”
    <i>Dynamic Games and Applications</i>. Springer Nature, 2025. <a href="https://doi.org/10.1007/s13235-025-00627-5">https://doi.org/10.1007/s13235-025-00627-5</a>.
  ieee: V. Hübner, C. Hilbe, M. Staab, M. Kleshnina, and K. Chatterjee, “Time-dependent
    strategies in repeated asymmetric public goods games,” <i>Dynamic Games and Applications</i>,
    vol. 15. Springer Nature, pp. 1617–1645, 2025.
  ista: Hübner V, Hilbe C, Staab M, Kleshnina M, Chatterjee K. 2025. Time-dependent
    strategies in repeated asymmetric public goods games. Dynamic Games and Applications.
    15, 1617–1645.
  mla: Hübner, Valentin, et al. “Time-Dependent Strategies in Repeated Asymmetric
    Public Goods Games.” <i>Dynamic Games and Applications</i>, vol. 15, Springer
    Nature, 2025, pp. 1617–45, doi:<a href="https://doi.org/10.1007/s13235-025-00627-5">10.1007/s13235-025-00627-5</a>.
  short: V. Hübner, C. Hilbe, M. Staab, M. Kleshnina, K. Chatterjee, Dynamic Games
    and Applications 15 (2025) 1617–1645.
corr_author: '1'
date_created: 2025-02-23T23:01:57Z
date_published: 2025-11-01T00:00:00Z
date_updated: 2026-04-07T12:30:56Z
day: '01'
ddc:
- '000'
department:
- _id: KrCh
doi: 10.1007/s13235-025-00627-5
ec_funded: 1
external_id:
  isi:
  - '001415587800001'
file:
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  creator: dernst
  date_created: 2025-12-30T08:01:35Z
  date_updated: 2025-12-30T08:01:35Z
  file_id: '20888'
  file_name: 2025_DynGamesAppl_Huebner.pdf
  file_size: 1126178
  relation: main_file
  success: 1
file_date_updated: 2025-12-30T08:01:35Z
fulldoi: https://doi.org/10.1007/s13235-025-00627-5
has_accepted_license: '1'
intvolume: '        15'
isi: 1
language:
- iso: eng
month: '11'
oa: 1
oa_version: Published Version
page: 1617-1645
project:
- _id: 0599E47C-7A3F-11EA-A408-12923DDC885E
  call_identifier: H2020
  grant_number: '863818'
  name: 'Formal Methods for Stochastic Models: Algorithms and Applications'
- _id: 260C2330-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '754411'
  name: ISTplus - Postdoctoral Fellowships
publication: Dynamic Games and Applications
publication_identifier:
  eissn:
  - 2153-0793
  issn:
  - 2153-0785
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
  record:
  - id: '19903'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: Time-dependent strategies in repeated asymmetric public goods games
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: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 15
year: '2025'
...
---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '19843'
abstract:
- lang: eng
  text: 'Social dilemmas are collective-action problems where individual interests
    are at odds with group interests. Such dilemmas occur frequently at all scales
    of human interactions. When dealing with collective-action problems, people often
    act reciprocally. They adjust their behavior to match the previous behavior of
    the recipient. The literature distinguishes two kinds of reciprocity. According
    to direct reciprocity, individuals react to their immediate experiences with the
    recipient. They are more likely to cooperate if the recipient previously cooperated
    with them. According to indirect reciprocity, individuals react to the recipient’s
    general behavior, irrespectively of whether or not they benefited directly. In
    practice, the two kinds of reciprocity are often intertwined; people typically
    base their decisions on both direct experiences and indirect observations. Yet
    only recently have researchers begun to explore how the two kinds of reciprocity
    interact. So far, this research only addresses a single type of social dilemma,
    the donation game, where the effects of individual behaviors are independent.
    Instead, here we allow for all pairwise social dilemmas. By applying novel techniques
    to generalize the theory of zero-determinant strategies, we establish an important
    proof of principle: In all social dilemmas, socially optimal outcomes can be sustained
    as an equilibrium, using either direct or indirect reciprocity, or arbitrary mixtures
    thereof. These results neither require games to be repeated infinitely often,
    nor that individual opinions are synchronized. In this way, we considerably generalize
    the scope of models of reciprocity, and we build further bridges between the literatures
    on direct and indirect reciprocity.'
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.).'
article_number: pgaf154
article_processing_charge: Yes
article_type: original
author:
- first_name: Valentin
  full_name: Hübner, Valentin
  id: 2c8aa207-dc7d-11ea-9b2f-f22972ecd910
  last_name: Hübner
  orcid: 0009-0001-5009-4987
- 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
citation:
  ama: Hübner V, Schmid L, Hilbe C, Chatterjee K. Stable strategies of direct and
    indirect reciprocity across all social dilemmas. <i>PNAS Nexus</i>. 2025;4(5).
    doi:<a href="https://doi.org/10.1093/pnasnexus/pgaf154">10.1093/pnasnexus/pgaf154</a>
  apa: Hübner, V., Schmid, L., Hilbe, C., &#38; Chatterjee, K. (2025). Stable strategies
    of direct and indirect reciprocity across all social dilemmas. <i>PNAS Nexus</i>.
    Oxford University Press. <a href="https://doi.org/10.1093/pnasnexus/pgaf154">https://doi.org/10.1093/pnasnexus/pgaf154</a>
  chicago: Hübner, Valentin, Laura Schmid, Christian Hilbe, and Krishnendu Chatterjee.
    “Stable Strategies of Direct and Indirect Reciprocity across All Social Dilemmas.”
    <i>PNAS Nexus</i>. Oxford University Press, 2025. <a href="https://doi.org/10.1093/pnasnexus/pgaf154">https://doi.org/10.1093/pnasnexus/pgaf154</a>.
  ieee: V. Hübner, L. Schmid, C. Hilbe, and K. Chatterjee, “Stable strategies of direct
    and indirect reciprocity across all social dilemmas,” <i>PNAS Nexus</i>, vol.
    4, no. 5. Oxford University Press, 2025.
  ista: Hübner V, Schmid L, Hilbe C, Chatterjee K. 2025. Stable strategies of direct
    and indirect reciprocity across all social dilemmas. PNAS Nexus. 4(5), pgaf154.
  mla: Hübner, Valentin, et al. “Stable Strategies of Direct and Indirect Reciprocity
    across All Social Dilemmas.” <i>PNAS Nexus</i>, vol. 4, no. 5, pgaf154, Oxford
    University Press, 2025, doi:<a href="https://doi.org/10.1093/pnasnexus/pgaf154">10.1093/pnasnexus/pgaf154</a>.
  short: V. Hübner, L. Schmid, C. Hilbe, K. Chatterjee, PNAS Nexus 4 (2025).
corr_author: '1'
date_created: 2025-06-15T22:01:30Z
date_published: 2025-05-01T00:00:00Z
date_updated: 2026-04-07T12:30:56Z
day: '01'
ddc:
- '000'
department:
- _id: KrCh
doi: 10.1093/pnasnexus/pgaf154
ec_funded: 1
external_id:
  pmid:
  - '40417077'
file:
- access_level: open_access
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  creator: dernst
  date_created: 2025-06-23T08:09:50Z
  date_updated: 2025-06-23T08:09:50Z
  file_id: '19867'
  file_name: 2025_PNASNexus_Huebner.pdf
  file_size: 2551195
  relation: main_file
  success: 1
file_date_updated: 2025-06-23T08:09:50Z
fulldoi: https://doi.org/10.1093/pnasnexus/pgaf154
has_accepted_license: '1'
intvolume: '         4'
issue: '5'
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc/4.0/
month: '05'
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: PNAS Nexus
publication_identifier:
  eissn:
  - 2752-6542
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
related_material:
  record:
  - id: '19903'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: Stable strategies of direct and indirect reciprocity across all social dilemmas
tmp:
  image: /images/cc_by_nc.png
  legal_code_url: https://creativecommons.org/licenses/by-nc/4.0/legalcode
  name: Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
  short: CC BY-NC (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 4
year: '2025'
...
---
OA_place: publisher
_id: '19903'
abstract:
- lang: eng
  text: "Cooperation, that is, one person paying a cost for another's benefit, is
    a fundamental principle without which no form of society could exist. The extent
    to which humans cooperate with each other is also an essential feature that differentiates
    them from other animals. Cooperation occurs even in the absence of altruistic
    motivations, when it is selfishly incentivised by the expectation of a future
    reward. For example, many economic interactions are well described that way. This
    kind of cooperation requires that people exhibit reciprocal behaviour that acts
    as a mechanism that rewards cooperation.\r\nWith game-theoretic models, it is
    possible to formally study potential such mechanisms and under what conditions
    they can exist. This thesis contributes to this effort by analysing recently introduced
    models of cooperation that advance on previous work by taking into account the
    potential for pre-existing inequality among cooperating individuals as well as
    the different forms that reciprocity can take.\r\nIndividuals may differ both
    intrinsically, in their abilities, as well as extrinsically, in the amount of
    resources they have available. Allowing for such differences in a model of cooperation
    helps to understand how inequality affects the potential for, and outcomes of,
    cooperation among unequals. In this thesis, it is shown that in the presence of
    intrinsic inequality, a similar unequal distribution of resources can increase
    the potential for cooperation. This effect is stronger the smaller the group is
    in which cooperation takes place. It is also shown that under particular assumptions,
    if the unequal members of a group vary the size of their contributions to a cooperative
    effort over time, they can thereby increase their efficiency and improve the collective
    outcome.\r\nCooperative behaviour in a two-person interaction can be rewarded
    either by direct reciprocation whenever the same two people interact again, or
    indirectly by a third party who observed the interaction. In the latter case of
    indirect reciprocity, individuals are proximally rewarded by a good reputation,
    which ultimately translates to being rewarded with cooperative behaviour by others.
    This mechanism can enable selfishly motivated cooperation even in circumstances
    where individuals are unlikely to meet again, akin to how money facilitates trade.
    While these two forms of reciprocity have mostly been studied in isolation, this
    thesis analyses both direct and indirect reciprocity in a general model in order
    to compare their relative effectiveness under different circumstances. The contribution
    of this thesis is an extension of previous work regarding a specific kind of interaction,
    whose parameters allow for convenient mathematical analysis, to the most general
    set of possible interactions."
acknowledgement: "The research for this thesis was supported by the European Research
  Council\r\n(grant agreements No. 863818 and No. 850529), the European Union’s Horizon
  2020 research and innovation programme (Marie Skłodowska-Curie grant agreement No.
  754411),\r\nthe Austrian Science Fund (grant DOI 10.55776/COE12), the French Agence
  Nationale\r\nde la Recherche under the Programme d’investissements d’avenir (project
  reference 17-\r\nEURE-0010) and the Australian Government through the Australian
  Research Council\r\n(grant No. SR200100005, “Securing Antarctica’s Environmental
  Future”)."
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Valentin
  full_name: Hübner, Valentin
  id: 2c8aa207-dc7d-11ea-9b2f-f22972ecd910
  last_name: Hübner
  orcid: 0009-0001-5009-4987
citation:
  ama: Hübner V. Reciprocity and inequality in social dilemmas. 2025. doi:<a href="https://doi.org/10.15479/AT-ISTA-19903">10.15479/AT-ISTA-19903</a>
  apa: Hübner, V. (2025). <i>Reciprocity and inequality in social dilemmas</i>. Institute
    of Science and Technology Austria. <a href="https://doi.org/10.15479/AT-ISTA-19903">https://doi.org/10.15479/AT-ISTA-19903</a>
  chicago: Hübner, Valentin. “Reciprocity and Inequality in Social Dilemmas.” Institute
    of Science and Technology Austria, 2025. <a href="https://doi.org/10.15479/AT-ISTA-19903">https://doi.org/10.15479/AT-ISTA-19903</a>.
  ieee: V. Hübner, “Reciprocity and inequality in social dilemmas,” Institute of Science
    and Technology Austria, 2025.
  ista: Hübner V. 2025. Reciprocity and inequality in social dilemmas. Institute of
    Science and Technology Austria.
  mla: Hübner, Valentin. <i>Reciprocity and Inequality in Social Dilemmas</i>. Institute
    of Science and Technology Austria, 2025, doi:<a href="https://doi.org/10.15479/AT-ISTA-19903">10.15479/AT-ISTA-19903</a>.
  short: V. Hübner, Reciprocity and Inequality in Social Dilemmas, Institute of Science
    and Technology Austria, 2025.
corr_author: '1'
date_created: 2025-06-25T13:50:10Z
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supervisor:
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  full_name: Chatterjee, Krishnendu
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title: Reciprocity and inequality in social dilemmas
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abstract:
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  text: 'Direct reciprocity is a powerful mechanism for cooperation in social dilemmas.
    The very logic of reciprocity, however, seems to require that individuals are
    symmetric, and that everyone has the same means to influence each others’ payoffs.
    Yet in many applications, individuals are asymmetric. Herein, we study the effect
    of asymmetry in linear public good games. Individuals may differ in their endowments
    (their ability to contribute to a public good) and in their productivities (how
    effective their contributions are). Given the individuals’ productivities, we
    ask which allocation of endowments is optimal for cooperation. To this end, we
    consider two notions of optimality. The first notion focuses on the resilience
    of cooperation. The respective endowment distribution ensures that full cooperation
    is feasible even under the most adverse conditions. The second notion focuses
    on efficiency. The corresponding endowment distribution maximizes group welfare.
    Using analytical methods, we fully characterize these two endowment distributions.
    This analysis reveals that both optimality notions favor some endowment inequality:
    More productive players ought to get higher endowments. Yet the two notions disagree
    on how unequal endowments are supposed to be. A focus on resilience results in
    less inequality. With additional simulations, we show that the optimal endowment
    allocation needs to account for both the resilience and the efficiency of cooperation.'
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.), the European Union’s Horizon 2020 research and innovation program
  under the Marie Skłodowska-Curie Grant Agreement #754411 and the French Agence Nationale
  de la Recherche (under the Investissement d’Avenir Programme, ANR-17-EURE-0010)
  (to M.K.).'
article_number: e2315558121
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author:
- first_name: Valentin
  full_name: Hübner, Valentin
  id: 2c8aa207-dc7d-11ea-9b2f-f22972ecd910
  last_name: Hübner
  orcid: 0009-0001-5009-4987
- first_name: Manuel
  full_name: Staab, Manuel
  last_name: Staab
- 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: Maria
  full_name: Kleshnina, Maria
  last_name: Kleshnina
citation:
  ama: Hübner V, Staab M, Hilbe C, Chatterjee K, Kleshnina M. Efficiency and resilience
    of cooperation in asymmetric social dilemmas. <i>Proceedings of the National Academy
    of Sciences of the United States of America</i>. 2024;121(10). doi:<a href="https://doi.org/10.1073/pnas.2315558121">10.1073/pnas.2315558121</a>
  apa: Hübner, V., Staab, M., Hilbe, C., Chatterjee, K., &#38; Kleshnina, M. (2024).
    Efficiency and resilience of cooperation in asymmetric social dilemmas. <i>Proceedings
    of the National Academy of Sciences of the United States of America</i>. National
    Academy of Sciences. <a href="https://doi.org/10.1073/pnas.2315558121">https://doi.org/10.1073/pnas.2315558121</a>
  chicago: Hübner, Valentin, Manuel Staab, Christian Hilbe, Krishnendu Chatterjee,
    and Maria Kleshnina. “Efficiency and Resilience of Cooperation in Asymmetric Social
    Dilemmas.” <i>Proceedings of the National Academy of Sciences of the United States
    of America</i>. National Academy of Sciences, 2024. <a href="https://doi.org/10.1073/pnas.2315558121">https://doi.org/10.1073/pnas.2315558121</a>.
  ieee: V. Hübner, M. Staab, C. Hilbe, K. Chatterjee, and M. Kleshnina, “Efficiency
    and resilience of cooperation in asymmetric social dilemmas,” <i>Proceedings of
    the National Academy of Sciences of the United States of America</i>, vol. 121,
    no. 10. National Academy of Sciences, 2024.
  ista: Hübner V, Staab M, Hilbe C, Chatterjee K, Kleshnina M. 2024. Efficiency and
    resilience of cooperation in asymmetric social dilemmas. Proceedings of the National
    Academy of Sciences of the United States of America. 121(10), e2315558121.
  mla: Hübner, Valentin, et al. “Efficiency and Resilience of Cooperation in Asymmetric
    Social Dilemmas.” <i>Proceedings of the National Academy of Sciences of the United
    States of America</i>, vol. 121, no. 10, e2315558121, National Academy of Sciences,
    2024, doi:<a href="https://doi.org/10.1073/pnas.2315558121">10.1073/pnas.2315558121</a>.
  short: V. Hübner, M. Staab, C. Hilbe, K. Chatterjee, M. Kleshnina, Proceedings of
    the National Academy of Sciences of the United States of America 121 (2024).
corr_author: '1'
date_created: 2024-03-05T09:18:49Z
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date_updated: 2026-04-07T12:30:56Z
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department:
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publication: Proceedings of the National Academy of Sciences of the United States
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  text: "in the research article \"Efficiency and resilience of cooperation in asymmetric
    social dilemmas\" (by Valentin Hübner, Manuel Staab, Christian Hilbe, Krishnendu
    Chatterjee, and Maria Kleshnina).\r\n\r\nWe used different implementations for
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author:
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  full_name: Hübner, Valentin
  id: 2c8aa207-dc7d-11ea-9b2f-f22972ecd910
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  orcid: 0009-0001-5009-4987
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  full_name: Kleshnina, Maria
  last_name: Kleshnina
citation:
  ama: Hübner V, Kleshnina M. Computer code for “Efficiency and resilience of cooperation
    in asymmetric social dilemmas.” 2024. doi:<a href="https://doi.org/10.5281/ZENODO.10639167">10.5281/ZENODO.10639167</a>
  apa: Hübner, V., &#38; Kleshnina, M. (2024). Computer code for “Efficiency and resilience
    of cooperation in asymmetric social dilemmas.” Zenodo. <a href="https://doi.org/10.5281/ZENODO.10639167">https://doi.org/10.5281/ZENODO.10639167</a>
  chicago: Hübner, Valentin, and Maria Kleshnina. “Computer Code for ‘Efficiency and
    Resilience of Cooperation in Asymmetric Social Dilemmas.’” Zenodo, 2024. <a href="https://doi.org/10.5281/ZENODO.10639167">https://doi.org/10.5281/ZENODO.10639167</a>.
  ieee: V. Hübner and M. Kleshnina, “Computer code for ‘Efficiency and resilience
    of cooperation in asymmetric social dilemmas.’” Zenodo, 2024.
  ista: Hübner V, Kleshnina M. 2024. Computer code for ‘Efficiency and resilience
    of cooperation in asymmetric social dilemmas’, Zenodo, <a href="https://doi.org/10.5281/ZENODO.10639167">10.5281/ZENODO.10639167</a>.
  mla: Hübner, Valentin, and Maria Kleshnina. <i>Computer Code for “Efficiency and
    Resilience of Cooperation in Asymmetric Social Dilemmas.”</i> Zenodo, 2024, doi:<a
    href="https://doi.org/10.5281/ZENODO.10639167">10.5281/ZENODO.10639167</a>.
  short: V. Hübner, M. Kleshnina, (2024).
corr_author: '1'
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