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Once you understand game theory, you understand the world.

Veritasium · explainer · Watch on YouTube

Probability & game theoryEvolution & genetics

What it is

Veritasium explores the Prisoner's Dilemma and Axelrod's tournaments, showing why tit-for-tat and forgiving strategies win in repeated games. It extends the ideas to cooperation in evolution and conflict.

Why Hacker News recommends it

HN commenters reach for it constantly as an approachable explanation of why cooperation and reciprocity are rational strategies.

  • 10 people recommended it
  • 8 different months
  • 2 strong recommendations
  • first 2023, last 2026

What HN commenters said

  1. “Veratasium just made an approachable video on this subject recently, I definitely recommend.”

    Approachable video rebutting fears that cooperation is impossible long term.

    hughesjj, 2024-01 · Strong recommendation · in “Cells across the body talk to each other about aging”

  2. “This Veritasium video is excellent, and makes the argument that there is something intrinsic in mathematics (game theory) that encourages prosocial behavior.”

    Argues mathematics itself encourages prosocial behavior.

    pants2, 2026-04 · Strong recommendation · in “The Future of Everything Is Lies, I Guess: Safety”

  3. “Veritasium had a great video on this very topic today, in fact”

    Covers the prisoner's dilemma and cooperation, relevant to crown shyness.

    ninkendo, 2023-12 · Recommendation · in “Crown shyness”

  4. “Veratasium's video brings me some modicum of hope at least”

    Offers some hope about cooperation and the prisoner's dilemma.

    aeonik, 2023-12 · Recommendation · in “You've just been fucked by psyops [video]”

  5. “I found it best explained in the Veritasium video on game theory”

    Best explanation of how game theory favors empathy but not too much.

    0wis, 2024-01 · Recommendation · in “Fairness and kindness are not weaknesses”

  6. “I really enjoyed Veritaseum’s recent take on the “Prisoners Dillema” and Game Theory”

    Covers the value of forgiving in game theory simulations with a good history.

    travisgriggs, 2024-03 · Recommendation · in “The Forgiver's Dilemma: Can Letting Go Set You Free?”

  7. “Veritasium did a piece about it for explaining for layman.”

    Layman explanation of tit for tat and when it works.

    braiamp, 2024-12 · Recommendation · in “U.S. Supreme Court will hear arguments over TikTok divestment law”

  8. “Vertasium has a great video talking how Tit-for-Tat (Copycat) wins as a strategy”

    Shows how tit-for-tat wins and describes the original strategy competition.

    tiffanyh, 2025-05 · Recommendation · in “Game theory illustrated by an animated cartoon game”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: prisoner's dilemma, tit for tat, cooperation, axelrod, evolutionary game theory

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