The Undoing Project

Lewis shows how Kahneman and Tversky’s collaboration challenged simple assumptions about rational human decisions.

Their contrasting temperaments helped them question assumptions neither would have challenged alone.

Quick judgments can depend on resemblance or memorable examples rather than reliable probabilities.

Their prospect theory describes choices relative to reference points, not just final amounts.

People mentally rewrite tragedies by changing particular events in the story.

Lewis also follows the personal tensions behind the public intellectual achievement.

• The biography is Lewis’s interpretation, not a formula for every collaboration.