---
title: Daniel Kahneman — who he was | RGM® Glossary
url: https://realgrowthmatters.com/glossary/daniel-kahneman/
updated: 2026-06-10
source_html: https://realgrowthmatters.com/glossary/daniel-kahneman/
---

# Daniel Kahneman

proper noun

System 1 decides, System 2 rationalizes — the psychology every pricing page quietly runs on.

Name
:   Daniel Kahneman

Lived
:   1934-2024

Nobel
:   Economic Sciences, 2002

Key work
:   Thinking, Fast and Slow (2011)

## Forms & parts of speech

Kahneman · proper noun

Psychologist; shorthand for behavioral realism.

"Price it like **Kahneman** is watching — losses loom twice as large as gains."

## Who he was, in plain terms

Daniel Kahneman was the psychologist who, with Amos Tversky, dismantled the rational-actor model of economics from inside its own journals. Their prospect theory (1979) earned him the 2002 Nobel in Economic Sciences — the first for a psychologist — and *Thinking, Fast and Slow* (2011) carried the work to every airport bookshop and marketing meeting on earth.

## The key ideas

Two systems — fast, automatic, associative System 1 and slow, effortful System 2 — with System 1 running most decisions including purchases. Prospect theory's core findings: losses hurt roughly twice as much as equivalent gains (loss aversion), people evaluate against reference points rather than absolutes, and framing the same fact differently changes the choice. Add anchoring — the first number seen drags every later estimate toward it — and you have the working physics of pricing pages.

## Why he still matters

Free-trial endowment, decoy pricing tiers, "save $40" versus "pay $40 more," defaults that stick — all are applications of his findings. He also supplied the field's conscience late in life, warning that the replication crisis weakened some priming research he had cited. The robust core — loss aversion, reference dependence, anchoring, the two systems — has held.

**Worked example.** A subscription product frames its annual plan as "$144/year." The Kahneman rewrite anchors the monthly price first ($15/mo), shows the annual as "2 months free" (a gain frame against the established reference), and makes annual the pre-selected default. Same arithmetic, three behavioral levers — and the annual mix shifts double digits without touching the price.

**Failure modes to watch.** Citing System 1 to justify dark patterns; treating every lab effect as field-proof after the replication crisis; and anchoring so aggressively the discount reads as fake and trips distrust instead.

## Synonyms & antonyms

### Synonyms

Daniel KahnemanKahnemanKahneman and Tversky

## Origin & history

Born 1934 in Tel Aviv, raised in occupied Paris; psychology at Hebrew University, PhD Berkeley (1961). The Tversky collaboration began in 1969 in Jerusalem; "Prospect Theory: An Analysis of Decision under Risk" appeared in Econometrica in 1979. Died March 2024.

Etymology: [source](https://en.wikipedia.org/wiki/Daniel_Kahneman).

## 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=daniel%20kahneman&date=today%205-y)

## Common questions

Who was Daniel Kahneman?
:   Israeli-American psychologist (1934-2024) who won the 2002 Nobel in Economics for prospect theory, developed with Amos Tversky.

What is Kahneman known for?
:   Thinking, Fast and Slow, the System 1/System 2 model, loss aversion, anchoring, and framing effects.

Why does Kahneman matter to marketers?
:   Pricing, framing, defaults, and trial design all run on his findings about how people actually choose — fast, reference-based, loss-averse.

## 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
- paper"Prospect Theory" — Kahneman & Tversky, Econometrica 1979
- referenceNobelPrize.org — 2002 laureate page

Curated, non-competitor resources verified per term.

## Related training

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

## Disciplines

Areas of marketing where daniel kahneman is a core concern:

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

## Read next

## Related terms

[Anchoring bias](/glossary/anchoring-bias/)[Cognitive bias](/glossary/cognitive-bias/)[Robert Cialdini](/glossary/robert-cialdini/)[A/B test](/glossary/ab-test/)[Conversion rate](/glossary/conversion-rate/)

## Sources

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