Newcomb's Paradox
A perfect predictor, two boxes, and one poisonous question: if your choice can’t change the past, why does one rational answer seem to make people rich and the other seem to make them feel right?
Quick Facts
- Period
- 1969 – 1969
- Region
- Americas
- Key Figures
- Allan Gibbard, David Lewis, James Joyce +3 more
Key Figures
Allan Gibbard
Critic/Developer
University of Michigan / philosophyAllan Gibbard emerged as one of the most influential moral philosophers of the late twentieth and early twenty-first cen...
David Lewis
Critic/Developer
Princeton / analytic philosophyDavid Lewis is one of the sharpest critics of the original anti-physicalist reading of Mary’s Room, and his importance l...
James Joyce
Successor/Developer
University of Michigan / decision theoryJames Joyce belongs to the later, more reflective phase of the Newcomb debate, but his importance lies less in taking a ...
Martin Gardner
Interlocutor
Scientific American / popular mathematicsMartin Gardner was one of the great mediators between technical thought and public imagination, but that description can...
Richard Jeffrey
Proponent/Developer
Decision theory / PrincetonRichard Jeffrey gave philosophical form to one of the deepest temptations in Newcomb’s Paradox: the thought that rationa...
William Newcomb
Originator
Lawrence Livermore Laboratory / physicsWilliam Newcomb occupies an unusual place in intellectual history: he is remembered for a puzzle, not a system. That fac...
The Story
This narrative combines documented history with dramatized scenes for storytelling purposes.
The World That Made It
By the late 1960s, decision theory had become one of the quiet engines of postwar philosophy and economics. It promised something both technical and morally cha...
The Central Idea
The heart of Newcomb’s Paradox lies in a seemingly modest claim: if a predictor is reliable enough, then the rational choice may be to take only the opaque box,...
The System
Once the puzzle is understood, Newcomb’s Paradox becomes less a single case than a stress test for an entire theory of rational agency. The central division is ...
Tensions & Critiques
The strongest objection to one-boxing is immediate and, to many minds, decisive. If the contents of the opaque box were fixed before the choice, how can the pre...
Legacy & Echoes
Newcomb’s Paradox left behind more than a puzzle. It helped reorganize decision theory into a field conscious of its own fractures. The old confidence that one ...
Timeline
Newcomb’s scenario enters print
**1969** — Martin Gardner publishes the paradox in Scientific American, giving a philosophically dense problem the form of a public intellectual challenge. The two-box setup immediately attracts attention because it appears to force a choice between dominance and expected payoff.
Jeffrey’s decision theory appears
**1965** — Richard Jeffrey publishes The Logic of Decision, later becoming one of the most important philosophical homes for evidential reasoning. Although the book predates the paradox’s fame, it supplies many of the conceptual tools later used to argue for one-boxing.
Causal decision theory crystallizes
**1976** — David Lewis and other philosophers help articulate the causal response to Newcomb’s Paradox. The idea that rational choice should depend on causal consequences rather than evidential correlations becomes a major position in the literature.
Newcomb discussions spread through analytic philosophy
**1979** — The paradox becomes a standard reference point in debates over rational choice, counterfactuals, and the interpretation of utility. Philosophers begin to use it as a test case for whether decision theory should be act-centered or policy-centered.
Decision-theoretic critique expands
**1980** — Philosophers and economists increasingly discuss Newcomb-like cases alongside Prisoner’s Dilemma and issues of precommitment. The paradox begins to influence broader work on strategic interaction and rational policy choice.
Policy-based approaches gain traction
**1987** — Work on decision procedures and stable policies begins to offer alternatives to both simple causal and simple evidential theories. Newcomb’s Paradox becomes a canonical reason to think about the rationality of rules rather than isolated acts.
Artificial intelligence and prediction concerns emerge
**1990** — As interest grows in computational agents and prediction-based systems, Newcomb-style problems begin to appear in more technical settings. The old thought experiment starts to look like a model for agents embedded in predictive environments.
Lewis’s causal framework continues to shape debate
**2001** — Even after Lewis’s death, causal decision theory remains one of the main reference points in discussions of the paradox. Later philosophers refine or challenge his approach, but they do so in a landscape he helped define.
Philosophical handbooks canonize the paradox
**2005** — Reference works and introductory texts treat Newcomb’s Paradox as a classic problem in decision theory. Its status shifts from curiosity to standard benchmark for any account of rational choice.
Gardner’s death closes a public-intellectual era
**2010** — Martin Gardner’s death marks the passing of the era in which a puzzle could leap from technical discussion into broad public attention through magazine exposition. The paradox remains alive, but the style of its dissemination changes.
Algorithmic prediction makes the puzzle newly vivid
**2012** — As data-driven prediction becomes central to everyday life, Newcomb’s setup acquires fresh relevance. The question of whether to respect or exploit highly accurate predictors becomes less fanciful and more like an image of modern systems.
Newcomb’s Paradox remains an active fault line
**2020** — Contemporary decision theory still treats the puzzle as a live issue rather than a settled case. Competing approaches continue to define themselves by how they handle the relation between prediction, evidence, and choice.
Sources
- primary_textMartin Gardner, "Newcomb's Problem and Two Principles of Choice"
Gardner’s classic popular presentation of the paradox.
- primary_textRichard Jeffrey, The Logic of Decision, 2nd ed.
Foundational work for evidential decision theory.
- primary_textDavid Lewis, "Causal Decision Theory"
Canonical statement of the causal response to Newcomb-like cases.
- referenceStanford Encyclopedia of Philosophy: "Newcomb's Problem"
Reliable overview of the debate and its main positions.
- referenceInternet Encyclopedia of Philosophy: "Newcomb's Problem"
Accessible summary of the paradox and major responses.
- scholarly_bookJames Joyce, The Foundations of Causal Decision Theory
Major development and defense of causal approaches.
- scholarly_articleAllan Gibbard and William L. Harper, "Counterfactuals and Two Kinds of Expected Utility"
Influential paper in the Newcomb literature.
- scholarly_articleEliezer Yudkowsky, "Timeless Decision Theory"
Later nonstandard approach influenced by Newcomb-like problems.
- scholarly_articleNate Soares, "Against Newcomb's Problem"
Representative of contemporary debate about decision procedures.
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