Nature September 2003 PMID 13679918

Monkeys reject unequal pay.

Sarah F Brosnan, Frans B M De Waal

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233
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across 7 sources since Mar 2013

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AI synopsis

What people are saying

Overall, the discussions reflect a strong agreement with the publication, with participants citing multiple studies and videos that demonstrate primate reactions to unfairness, relying on technical language and examples like specific rewards (cucumbers vs. grapes). The tone is analytical and focused on scientific depth, underscoring the significance of these findings in understanding both animal and human social behavior.

AgreementModerate agreement

Most discussions acknowledge the findings, emphasizing that primates, particularly monkeys, reject unfair rewards, aligning with the publication’s conclusions.

InterestHigh interest

Posts demonstrate high interest by referencing multiple scientific sources and discussing evolutionary implications, showing engagement beyond surface-level reactions.

EngagementModerate engagement

The discussions involve quoting studies, sharing videos, and debating the complexity of animal morality and fairness, indicating active participation.

ImpactModerate impact

The extensive sharing of scientific articles, videos, and debates about the evolution of morality suggests these discussions have meaningful influence on understanding animal behavior and ethical considerations.

Abstract in brief

  • Monkeys, like humans, may compare their rewards to others and react negatively when they perceive unfairness, suggesting that a sense of fairness might have an evolutionary basis.
  • The study shows brown capuchin monkeys refuse to participate when they see another monkey receiving a better reward for the same effort, especially if the other gets the reward without effort, indicating they have a form of inequity aversion.
  • These findings imply that the feeling of unfairness and reactions to it are not unique to humans but may have originated early in evolution among cooperative animals.]

Top posts

Most liked on X and Bluesky
Hironori Funabiki
@HironoriFunabi1 · X

おそらくフサオマキザル(Cebus apella)で示された研究(https://t.co/5cRPbzkBRi)が元になった話で、この動画(https://t.co/EBwALQOu1m)では鳥や犬でも同様の「不公平感」が認められていることが話されている。ただ、動画のインパクトは強いが、原著論文を読むとそれほど単純ではないかも。1/ https://t.co/Iva4SZv1AJ

Feb 6, 2022 · 19 likes · 8 shares · 9,702 followers View post →
CONTEXT VIDEOS
@Context2X · X

“Monkeys reject unequal pay,” a 2003 study where one subject was rewarded with a cucumber and the other with a much more desirable grape (for the same work https://t.co/mrklFJlu9V

Dec 9, 2025 · 14 likes · 3 shares · 11,350 followers View post →
Arnaud Stupid Economics
@Stupid_Eco · X

CORRECTION de la dernière vidéo : Je dis que les signes capucins ont tendance à préférer une distribution égalitaire, FAUX comme dirait l'autre. C'est beaucoup plus compliqué mais heureusement @HomoFabulus l'explique très bien dans cette vidéo : https://t.co/CNoMI9bByu

Mar 11, 2019 · 13 likes · 13,764 followers View post →
いっちー@バーチャル精神科医
@ichiipsy · X

Monkeys reject unequal pay. Nature 425, 297–299 (2003). https://t.co/zdYuw9dVth

Aug 1, 2022 · 11 likes · 2 shares · 80,196 followers View post →
EvoSapiens FR (ex Homo Fabulus)
@EvoSapiensFR · X

C'est d'ailleurs précisément pour essayer de ne pas tomber dans un de ces travers (le animal-bashing, et le human-bashing) et apporter une vision nuancée que j'ai lancé ma série "animale" sur Homo Fabulus (un seul épisode pour l'instant https://t.co/10jAvZzNcb ) 5/5

Mar 21, 2019 · 7 likes · 9,655 followers View post →
Nomorsad
@nomorsad · X

@Rainmaker1973 An explanation of this video and other things about animals' fairness (in French sorry) https://t.co/X1ztXp4lBk

Dec 11, 2022 · 6 likes · 172 followers View post →

All mentions

Julianna Gibsoni
@GibsoniJul51837 · X

RT @Context2X: “Monkeys reject unequal pay,” a 2003 study where one subject was rewarded with a cucumber and the other with a much more des…

Dec 10, 2025 · 3 shares · 2 followers View post →
Happy Content Hub
@HappyContentHub · X

RT @HappyContentHub: “Monkeys reject unequal pay,” a 2003 study where one subject was rewarded with a cucumber and the other with a much mo…

Dec 10, 2025 · 1 share · 19 followers View post →
Dex Emry
@dex60822 · X

RT @Context2X: “Monkeys reject unequal pay,” a 2003 study where one subject was rewarded with a cucumber and the other with a much more des…

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VIDEOS HUB
@videos_hubs · X

RT @Context2X: “Monkeys reject unequal pay,” a 2003 study where one subject was rewarded with a cucumber and the other with a much more des…

Dec 9, 2025 · 3 shares · 234 followers View post →
Happy Content Hub
@HappyContentHub · X

“Monkeys reject unequal pay,” a 2003 study where one subject was rewarded with a cucumber and the other with a much more desirable grape (for the same work) https://t.co/qHPOEe1L2B

Dec 9, 2025 · 1 share · 19 followers View post →
CONTEXT VIDEOS
@Context2X · X

“Monkeys reject unequal pay,” a 2003 study where one subject was rewarded with a cucumber and the other with a much more desirable grape (for the same work https://t.co/mrklFJlu9V

Dec 9, 2025 · 14 likes · 3 shares · 11,350 followers View post →
AmiN
@Amin_n88 · X

@av3kazemi استاد در تحقیقات "Monkeys Reject Unequal Pay" منتشر شده در مجله Nature (2003) ثابت شده میمون‌ها هم بی‌عدالتی رو تاب نمیارن. شما چه جانوری هستید که نسبت به بی‌عدالتی بی‌تفاوتیید؟

Nov 27, 2025 · 2 likes · 365 followers View post →
A Disgruntled dwarf
@MarcelloVa40637 · X

RT @PicturesFoIder: “Monkeys reject unequal pay,” a 2003 study where one subject was rewarded with a cucumber and the other with a much mor…

Nov 16, 2025 · 106 shares · 70 followers View post →
Dev
@sleepy_devo · X

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Nov 16, 2025 · 106 shares · 12,360 followers View post →
Ankit Tak
@trippyankit · X

RT @Rainmaker1973: Monkeys reject unequal pay. A 2003 study where one monkey got a cucumber while the other received a far more desirable…

Nov 11, 2025 · 44 shares · 194 followers View post →
Ü M I T •A H M E T •Y A V A Ş
@Yvsumit1 · X

RT @Rainmaker1973: Monkeys reject unequal pay. A 2003 study where one monkey got a cucumber while the other received a far more desirable…

Nov 7, 2025 · 44 shares · 261 followers View post →
Perazzetti2
@Perazzetti_ · X

Pure le scimmie s'incazzano se non trattate equamente https://t.co/W86QjkLKXQ Qui dimostriamo che un primate non umano, il cebo cappuccino bruno (Cebus apella), risponde negativamente alla distribuzione ineguale della ricompensa negli scambi con uno sperimentatore umano.

Nov 5, 2025 · 1 like · 197 followers View post →
Lina
@LinaDenezhkin41 · X

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Lina
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Nov 1, 2025 · 118 shares · 97 followers View post →
Dorothy Eubanks
@DorothyEubank16 · X

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Oct 31, 2025 · 5 shares · 5,300 followers View post →
CupcakeDreams
@Cupcake_fghre · X

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Oct 29, 2025 · 118 shares · 753 followers View post →
Younger brother
@Dearyou04 · X

Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the same task https://t.co/M3zxPffFtW

Oct 28, 2025 · 2 likes · 14 followers View post →
Sauvignon
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ジャガンナート
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TheDogeFatherMaximus
@TheDogeFatherMx · X

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arsad sugiharto
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Oct 25, 2025 · 118 shares · 234 followers View post →
Joker
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Dr. Biju Raju
@drbijuraju · X

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@dschmidthawk · X

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Mic Lydd
@carzyMic · X

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Oct 25, 2025 · 4 shares · 880 followers View post →
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Oct 25, 2025 · 118 shares · 544 followers View post →
Joe
@RogueJoe33 · X

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Oct 25, 2025 · 118 shares · 199 followers View post →
Time Pass with Information
@Time_Pass_Info · X

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Oct 25, 2025 · 118 shares · 796 followers View post →
TSE TSE
@chengszt · X

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Oct 25, 2025 · 118 shares · 10 followers View post →
Anup Singh
@anupsinghanubis · X

RT @gunsnrosesgirl3: Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the s…

Oct 25, 2025 · 118 shares · 191 followers View post →
Twitman
@Twitman840573 · X

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Oct 25, 2025 · 118 shares · 26 followers View post →
Tony
@Anthony42110245 · X

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Love_All
@dingdong0to9 · X

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Creator
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TheWiseRapist
@TheWiseRapist · X

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Ανθή
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feminityisdivinty
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Oct 24, 2025 · 118 shares · 9 followers View post →
JaNK0Bot
@JaNK0Bot · X

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Vincent Bilello
@skitterlad · X

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B
@ariban99 · X

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JJK
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Royyan 'Arts
@royyana1304971 · X

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Brian Flores Sabotaged Us
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爪乇ㄒ卂ㄥ几乇ᗪ
@MetalNED · X

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Dave Hunter
@hypnocoach183 · X

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Oct 24, 2025 · 118 shares · 2,932 followers View post →
Jon Kanh
@JonKanh · X

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Daniel Tissera
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RT @Rainmaker1973: Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the sam…

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Conni &
@freitagsfrau · X

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Héctor Otero
@hector_otero · X

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72 & Amsterdam.
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Good Job Sean!
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Explico Narrando
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@Bad_Autobot · X

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sɹǝpuɐ lɐɯ ǝƃuıp ǝıp ǝʇɥɔɐɹʇǝq
@JoleRI791 · X

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政府の赤字は国民の黒字
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RT @gunsnrosesgirl3: Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the s…

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urca!
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Moments that Matter
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daughter of zeus
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War=Ecocide ↩ le Condition Humaine #TeamLEGO ~~~
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TREES4DAYS
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Carlos Eduardo
@carlose34 · X

RT @gunsnrosesgirl3: Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the s…

Oct 24, 2025 · 118 shares · 8,283 followers View post →
Rudi Wolf
@RudiWolf10 · X

RT @gunsnrosesgirl3: Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the s…

Oct 24, 2025 · 118 shares · 512 followers View post →
Tiffany Timbric
@tiffany_timbric · X

RT @gunsnrosesgirl3: Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the s…

Oct 24, 2025 · 118 shares · 679 followers View post →
Sundance Kid 220
@sundancekid220 · X

RT @Rainmaker1973: Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the sam…

Oct 24, 2025 · 24 shares · 989 followers View post →
DaniVoss
@DaniKurts · X

RT @gunsnrosesgirl3: Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the s…

Oct 24, 2025 · 118 shares · 62 followers View post →
NBA Centel
@thenbacentel-m.bsky.social · Bluesky

Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the same task.

Oct 24, 2025 View post →
Massimo
@rainmaker1973-m.bsky.social · Bluesky

Monkeys reject unequal pay; a study where one was given a cucumber and the other a much more desirable grape for the same task.

Oct 24, 2025 View post →
Massimo :bot:
@rainmaker1973.zpravobot.news.ap.brid.gy · Bluesky

Massimo

Oct 21, 2025 View post →
Massimo :bot:
@rainmaker1973.zpravobot.news.ap.brid.gy · Bluesky

Monkeys reject unequal pay. A 2003 study where one monkey got a cucumber while the other received a far more desirable grape for the same task. https://twitter.com/Rainmaker1973/status/1980519527806083579

Oct 21, 2025 View post →
r/popular España
@reddit-espana-bot.bsky.social · Bluesky

“Monkeys reject unequal pay,” a 2003 study where one subject was rewarded with a cucumber and the other with a much more desirable grape (for the same work) https://www.reddit.com/r/interestingasfuck/comments/1obwils/monkeys_reject_unequal_pay_a_2003_study_where_one/

Oct 20, 2025 View post →
Redsky
@redsky.pirhoo.com · Bluesky

Monkeys reject unequal pay, a 2003 study where one subject was rewarded with a cucumber and the other with a much more desirable grape (for the same work) Link | Subreddit

Oct 20, 2025 · 1 like View post →
ABH
@hypusine.bsky.social · Bluesky

Because they have privilege, they (as a group, I know there are counter examples) also have disproportionate access to resources. Reject the premise that white males have privilege and DEI will strike you as unfair. I think that's hardwired in primates: pubmed.ncbi.nlm.nih.gov/13679918/

May 27, 2025 · 1 like · 1 share View post →
Juan I. Jorquera, Ph.D.
@jijorquera.bsky.social · Bluesky

About the evolution of morality: Inequity aversion has evolved over tens of millions of years. Capuchin monkeys reject unequal pay for the same activity, as Sarah Brosnan demonstrated in the video of the link. jijorquera.wixsite.com/onscienceand... #onscienceandsociety

Jan 16, 2025 View post →
Kolk/Os_
@os_kolk · X

@bobbin2fil @ProjetKairos @willounet Détrompe toi. Je te renvoies une fois encore à toute la série de homo fabuleuse sur le sujet. Celle ci notamment https://t.co/ljcKB09Nl2

Sep 17, 2024 · 19 followers View post →
Gender-Critical Citations
@terfcitations · X

Sarah Brosnan and Frans de Waal, 2003. Monkeys reject unequal pay. Nature 425, 297–299 (2003). https://t.co/2184a7JQwV.

May 28, 2023 · 731 followers View post →
Nomorsad
@nomorsad · X

@Rainmaker1973 An explanation of this video and other things about animals' fairness (in French sorry) https://t.co/X1ztXp4lBk

Dec 11, 2022 · 6 likes · 172 followers View post →
John Attend
@D_Jonathan_PhD · X

https://t.co/V1jFoZa36u

Nov 1, 2022 · 743 followers View post →
LibKey
@libkey_io · X

@ichiipsy Access the paywalled article from your library: https://t.co/SqbSF25MvP Promote scholarly access to content by simply adding https://t.co/SXSePSX5De to the DOI URL

Aug 1, 2022 · 553 followers View post →
あちゃら
@acala0 · X

RT @ichiipsy: Monkeys reject unequal pay. Nature 425, 297–299 (2003). https://t.co/zdYuw9dVth

Aug 1, 2022 · 2 shares · 2,471 followers View post →
いっちー@バーチャル精神科医
@ichiipsy · X

Monkeys reject unequal pay. Nature 425, 297–299 (2003). https://t.co/zdYuw9dVth

Aug 1, 2022 · 11 likes · 2 shares · 80,196 followers View post →
Nausicaa
@pheacienne · X

@BerylCeline @MartinSoussirac @FerghaneA @Cluster_17 https://t.co/NfZzhvl3pI

Mar 29, 2022 · 12,458 followers View post →
森見
@morimi_k · X

RT @HironoriFunabi1: おそらくフサオマキザル(Cebus apella)で示された研究(https://t.co/5cRPbzkBRi)が元になった話で、この動画(https://t.co/EBwALQOu1m)では鳥や犬でも同様の「不公平感」が認められてい…

Feb 7, 2022 · 8 shares · 136 followers View post →
Charly
@schiele_00 · X

RT @HironoriFunabi1: おそらくフサオマキザル(Cebus apella)で示された研究(https://t.co/5cRPbzkBRi)が元になった話で、この動画(https://t.co/EBwALQOu1m)では鳥や犬でも同様の「不公平感」が認められてい…

Feb 7, 2022 · 8 shares · 252 followers View post →
さもありなん:TLほぼ追えてないぽんこつモードなう
@ikotto · X

RT @HironoriFunabi1: おそらくフサオマキザル(Cebus apella)で示された研究(https://t.co/5cRPbzkBRi)が元になった話で、この動画(https://t.co/EBwALQOu1m)では鳥や犬でも同様の「不公平感」が認められてい…

Feb 7, 2022 · 8 shares · 355 followers View post →
( ゚д゚) T A M A 産
@yastomohalumisa · X

RT @HironoriFunabi1: おそらくフサオマキザル(Cebus apella)で示された研究(https://t.co/5cRPbzkBRi)が元になった話で、この動画(https://t.co/EBwALQOu1m)では鳥や犬でも同様の「不公平感」が認められてい…

Feb 7, 2022 · 8 shares · 1,722 followers View post →
すかもめ
@acetylseagull1 · X

RT @HironoriFunabi1: おそらくフサオマキザル(Cebus apella)で示された研究(https://t.co/5cRPbzkBRi)が元になった話で、この動画(https://t.co/EBwALQOu1m)では鳥や犬でも同様の「不公平感」が認められてい…

Feb 7, 2022 · 8 shares · 510 followers View post →
Takashi Okumura
@tweeting_drtaka · X

RT @HironoriFunabi1: おそらくフサオマキザル(Cebus apella)で示された研究(https://t.co/5cRPbzkBRi)が元になった話で、この動画(https://t.co/EBwALQOu1m)では鳥や犬でも同様の「不公平感」が認められてい…

Feb 7, 2022 · 8 shares · 8,163 followers View post →
muumuu
@fufumfutale · X

RT @HironoriFunabi1: おそらくフサオマキザル(Cebus apella)で示された研究(https://t.co/5cRPbzkBRi)が元になった話で、この動画(https://t.co/EBwALQOu1m)では鳥や犬でも同様の「不公平感」が認められてい…

Feb 6, 2022 · 8 shares · 251 followers View post →
Hironori Funabiki
@HironoriFunabi1 · X

おそらくフサオマキザル(Cebus apella)で示された研究(https://t.co/5cRPbzkBRi)が元になった話で、この動画(https://t.co/EBwALQOu1m)では鳥や犬でも同様の「不公平感」が認められていることが話されている。ただ、動画のインパクトは強いが、原著論文を読むとそれほど単純ではないかも。1/ https://t.co/Iva4SZv1AJ

Feb 6, 2022 · 19 likes · 8 shares · 9,702 followers View post →
Hurt
@el_famoso_shur · X

@Bouteflikov @Esban_ Pour relativiser sur les animaux altruistes https://t.co/M88pVo7QMB

Aug 1, 2021 · 34 followers View post →
Something Went Wrong
@_Sth_Went_Wrong · X

@SciencesPoulet @Tankietfield @LCP @moreaujb23 Pour la moral, je pense à cette vidéo de @HomoFabulus : https://t.co/NJswrA93PP Pour l'homme badass à ce thread : https://t.co/7IppJx1E3E Notre vie en société et sécurité est bien éloignée de l'animal craintif et dont le groupe est régi par des dominants.

Oct 7, 2020 · 1 like · 58 followers View post →
Mystère Rabbit d'Utopia
@Utopia_Rabbit · X

@azo__oza @30millionsdamis @GaelGiraud_CNRS Ah ok, Topito ce sont donc des spécialistes du comportement animalier ? Voici au contraire une vidéo, qui cite sur une quinzaine de publications scientifiques qui met en doute l'idée de solidarité inter-espece (au sens moral). https://t.co/ALbcSy0ubI

May 18, 2020 · 2,695 followers View post →
Matthieu Debrisay
@matthieudebris4 · X

RT @stdebove: Et enfin @homofabulus. Qualité pas terrible mais je le mets quand même. Vous connaissez mon avis sur ces approches biologique…

Mar 1, 2020 · 2 shares · 41 followers View post →
@fendrelair.bsky.social
@fendrelair · X

@meldurand3 @sylviedebiga Le précablage moral n'a été mis en évidence que chez l'humain, pas chez l'animal (même chez les singes) : seulement l'empathie. C'est cette autre vidéo qui m'a montré que je confondais empathie et sens moral : https://t.co/6GSd9Ayhcc

Oct 7, 2019 · 1 like · 623 followers View post →
@fendrelair.bsky.social
@fendrelair · X

Entre le #1 et le #2, vous avez même un spin-off ⬇️ : (car qd il dit que la morale permet de nous extraire de notre condition animale, j'ai tiqué, et je me suis aperçu que je confondais empathie etc avec morale. Bref j'étais continuiste sans le savoir...) https://t.co/6GSd9APSAM https://t.co/OIJaljMXh2

Oct 5, 2019 · 623 followers View post →
delacokeetdesputes
@SuperJavel3600 · X

@DidierRoustan @OlivierCyran https://t.co/3oKhVhdDta

Aug 10, 2019 · 33 followers View post →
Bruno Garnier
@BrunoSWAC · X

Vidéo passionnante d'un jeune docteur en sciences cognitives : @HomoFabulus by @stdebove Votre chien est-il un animal moral ? - feat Noké & Cie https://t.co/cV5a2BRdiE via @YouTube

Jul 24, 2019 · 2 likes · 1,377 followers View post →
Emma
@cokkie852 · X

@petersg83 https://t.co/DUlvbObQmh

May 8, 2019 · 505 followers View post →
Rémi Grassart
@RemiGrassart · X

https://t.co/F6Tk8by6Fa

May 1, 2019 · 155 followers View post →
Pantamis
@TheoPantamis · X

@CLE_Autistes @emma_ducros Attention à la surinterprétation, c'est plus compliqué que ça quand même : https://t.co/Q6CQI6HzXm De l'autre côté, beaucoup d'espèces animales laissent tomber leur petits les plus faibles pour assurer leur descendance avec les plus forts par exemple.

Apr 10, 2019 · 1,469 followers View post →
EvoSapiens FR (ex Homo Fabulus)
@EvoSapiensFR · X

C'est d'ailleurs précisément pour essayer de ne pas tomber dans un de ces travers (le animal-bashing, et le human-bashing) et apporter une vision nuancée que j'ai lancé ma série "animale" sur Homo Fabulus (un seul épisode pour l'instant https://t.co/10jAvZzNcb ) 5/5

Mar 21, 2019 · 7 likes · 9,655 followers View post →
Arnaud Stupid Economics
@Stupid_Eco · X

CORRECTION de la dernière vidéo : Je dis que les signes capucins ont tendance à préférer une distribution égalitaire, FAUX comme dirait l'autre. C'est beaucoup plus compliqué mais heureusement @HomoFabulus l'explique très bien dans cette vidéo : https://t.co/CNoMI9bByu

Mar 11, 2019 · 13 likes · 13,764 followers View post →
Shaomi
@shaomiao · X

https://t.co/5NszNwRaWY

Jan 25, 2019 · 1,022 followers View post →
Marc Brooks
@idisposable.github365.com · Bluesky

Capuchin monkeys reject unequal pay. http://j.mp/OnFairness

Mar 15, 2013 View post →