Newcomb’s Problem Explained: One Box Or Two?

Newcomb’s Problem is one of the strangest and most influential puzzles in philosophy, decision theory, and AI. Should you take one box or two? Really, this is a deviant case where it pays to be irrational.

In this video, I walk through the classic setup from Robert Nozick’s 1969 paper Newcomb’s Problem and Two Principles of Choice. We cover the arguments for one-boxing and two-boxing, explain why two-boxing is ultimately the right answer, and explore why Newcomb’s Problem is really a test for decision theories—not your intuition.

What’s inside:

• The case for one-boxing
• The case for two-boxing
• Why Newcomb’s Problem pays you to be irrational
• How decision theory works (utilities, dominance, evidential vs. causal decision theory)
• Why philosophers split almost evenly on this puzzle
• Why decision theorists overwhelmingly favor two-boxing
• How Newcomb’s Problem functions like the Trolley Problem—great for clarity, bad for obsessing over

I'll also offer explanations for why this seemingly cut-and-dried problem still makes waves and controversy.

Bottom line:

Newcomb’s Problem is cool, culturally sticky, and great for thinking—but the choice itself is easy. Take both boxes (but hope/act in ways that will get the predictor to make a mistake).