---
title: Thinking, Fast and Slow — the book | RGM® Glossary
url: https://realgrowthmatters.com/glossary/thinking-fast-and-slow/
updated: 2026-06-10
source_html: https://realgrowthmatters.com/glossary/thinking-fast-and-slow/
---

# Thinking, Fast and Slow

/ˈθɪŋkɪŋ, fæst ənd sloʊ/proper noun

System 1 is reading this tagline. System 2 will decide whether to admit it.

Author
:   Daniel Kahneman

Published
:   2011, Farrar, Straus & Giroux

Core model
:   System 1 / System 2

Sales
:   2.6M+ copies

## Forms & parts of speech

Thinking, Fast and Slow · title

Shorthand for the two-system model.

"That's a **Thinking, Fast and Slow** problem — the buyer never engages System 2."

## What the book says

*Thinking, Fast and Slow* compresses five decades of research — much of it with Amos Tversky — into one architecture: System 1, the fast, automatic, associative machine that runs most of life, and System 2, the slow, lazy auditor that mostly rubber-stamps. From this flow the catalog every marketer now recites — anchoring, loss aversion, framing, availability, the planning fallacy, WYSIATI (what you see is all there is), and the experiencing-versus-remembering self.

## The ideas people quote

Losses loom about twice as large as gains; the anchor drags every estimate toward it; ease of recall masquerades as truth (availability); cognitive ease feels like validity — fluent, familiar, repeated things read as true; the peak-end rule governs how experiences are remembered; and his career summary — 'we are blind to our blindness.'

## How to read it now

Read it as the master index to behavioral marketing, with the replication-era footnote the author himself endorsed: the priming chapter weakened, but the core — prospect theory, anchoring, framing, the two-system architecture — stands on mountains of data. For practitioners the working translation is simple: design for System 1 (defaults, frames, ease), and respect the reader enough not to weaponize it.

**Worked example.** A pricing page lists three tiers in ascending order, cheapest first. The Kahneman redesign anchors high — premium tier first, the target tier beside it framed as 'save 40%,' annual billing as the default, and the loss frame on downgrade ('you'll lose your history'). Same prices, different physics. The target tier's share doubles, because the page now works with the mind buyers actually bring to it.

**Failure modes to watch.** Citing the book to justify dark patterns it would condemn; treating every lab effect as field-proof post-replication-crisis; and designing for biases while forgetting the trust cost when customers notice.

## Synonyms & antonyms

### Synonyms

Thinking Fast and Slow

## Origin & history

Kahneman wrote it in his late seventies as the summing-up of the research program he and Amos Tversky began in Jerusalem in 1969, after years of resisting a popular book. Published October 2011 by Farrar, Straus & Giroux; the title names the two systems he borrowed from psychologists Keith Stanovich and Richard West.

Etymology: [source](https://en.wikipedia.org/wiki/Thinking,_Fast_and_Slow).

## Usage trends

Search interest for this term over the last five years:

[View interest-over-time on Google Trends →](https://trends.google.com/trends/explore?q=thinking%20fast%20and%20slow&date=today%205-y)

## Common questions

Who wrote Thinking, Fast and Slow?
:   Daniel Kahneman, Nobel laureate psychologist, published 2011 — synthesizing his research with Amos Tversky.

What is the book's core model?
:   System 1 (fast, automatic) does most deciding; System 2 (slow, effortful) audits rarely — biases live in the gap.

Did the book survive the replication crisis?
:   Its core — prospect theory, anchoring, framing, loss aversion — replicated robustly. The social-priming chapter did not, as Kahneman acknowledged.

## Related tools & calculators

- tool[Experiment planner](/tools/experiment-planner/)
- tool[Funnel drop-off analyzer](/tools/funnel-drop-off-analyzer/)

## Resources & people to follow

- book*Thinking, Fast and Slow* — Daniel Kahneman (the subject)
- paper"Prospect Theory" — Kahneman & Tversky (1979)
- book*The Undoing Project* — Michael Lewis (the story behind it)

Curated, non-competitor resources verified per term.

## Related training

- module[CRO & experimentation](/training/cro-experimentation/)

## Disciplines

Areas of marketing where thinking, fast and slow is a core concern:

[Growth strategy](/training/growth-marketing-foundations/)[Analytics](/training/marketing-analytics/)

## Read next

## Related terms

[Daniel Kahneman](/glossary/daniel-kahneman/)[Anchoring bias](/glossary/anchoring-bias/)[Cognitive bias](/glossary/cognitive-bias/)[Robert Cialdini](/glossary/robert-cialdini/)[A/B test](/glossary/ab-test/)

## Sources

1. trends[Google Trends — "thinking fast and slow"](https://trends.google.com/trends/explore?q=thinking%20fast%20and%20slow&date=today%205-y)