Decisions are bets, not verdicts

In 2018 Annie Duke published Thinking in Bets, drawing on her career as one of the world's top poker players and her academic training in cognitive psychology. The central claim is compressed in the title: every significant decision is a bet, made under uncertainty, with incomplete information. Treating decisions as verdicts — as if getting the right answer were simply a matter of reasoning hard enough — is the source of an enormous amount of unnecessary frustration and bad thinking.

Duke introduces the term 'resulting': the tendency to judge the quality of a decision by its outcome. A driver who runs a red light and gets home safely has made a terrible decision; a driver who stops at every light and is hit by a drunk driver has made a fine one. Confusing the two — which we do constantly — teaches us the wrong lessons and skews future choices accordingly.

Poker, she argues, is a particularly clear lens because it makes explicit what most decisions conceal: the role of luck. In a single hand, the best play frequently loses. Over thousands of hands, good decisions aggregate into positive results. The discipline is to evaluate choices on process rather than outcome, and to maintain that discipline even when a string of bad results feels like evidence that the process is wrong.

One of the book's practical ideas is the use of 'decision pods' — small groups who commit to evaluating each other's reasoning rather than just outcomes, and who try to remove hindsight bias from post-mortems. The concept adapts naturally beyond trading and investment to any domain where the feedback loop between decision and outcome is long or noisy.

Duke is candid about the limits of her poker frame: life is not a casino, and some situations are genuinely less probabilistic than others. But the core habit she recommends — asking 'what are the possible outcomes, and what is my best estimate of their likelihood?' — applies remarkably widely.