Daniel Kahneman was the only psychologist who acknowledged the problem of fat tails.

True if, as of 2024-03-30, Kahneman acknowledged the fat-tails problem (for example by publicly accepting Taleb's critique, or in his writings), and no other psychologist is known to have explicitly addressed or acknowledged fat-tailed distributions or the problems they create. Mostly true if Kahneman acknowledged it and only one or two obscure psychologists also did. Mixed if Kahneman acknowledged it but several other psychologists also did. Mostly false if Kahneman's acknowledgement is weak or uncertain, or if many psychologists (for example in risk perception, decision science or psychometrics) have published on fat tails or heavy-tailed distributions. False if Kahneman never acknowledged the problem, or if acknowledgement is widespread among psychologists.

Set before the research began.

1. E1 Nassim Taleb — Meditations on Extremistan (#158) Joseph Walker (podcast) · 20 September 2024 Own record

   “he said it publicly, but he had told me privately, “Yeah, I agree. It doesn't work under fat tails.””

2. E2 Nassim Taleb — Meditations on Extremistan (#158) Joseph Walker (podcast) · 20 September 2024 Own record

   “He said, “in Taleb’s world.” I mean, I'm talking about the real world. I don't own the world.”

3. E3 Nassim Taleb — Meditations on Extremistan (#158) Joseph Walker (podcast) · 20 September 2024 Own record

   “Danny doesn't make claims, but Tetlock didn't get it, didn’t even know what we're talking about.”

4. E4 Fat Tails in Human Judgment: Empirical Evidence and Implications for the Aggregation of Estimates and Forecasts IDEAS/RePEc (listing of Management Science, vol. 72, issue 3) · 2 February 2026

   “Fat Tails in Human Judgment: Empirical Evidence and Implications for the Aggregation of Estimates and Forecasts”

5. E5 Nassim Taleb — Meditations on Extremistan (#158) Joseph Walker (podcast transcript) · 20 September 2024 Own record

   “I mean, he said it publicly, but he had told me privately, “Yeah, I agree. It doesn't work under fat tails.””

6. E6 Nassim Taleb — Meditations on Extremistan (#158) Joseph Walker (podcast transcript) · 20 September 2024 Own record

   “He said, “in Taleb’s world.” I mean, I'm talking about the real world.”

7. E7 Statistical Consequences of Fat Tails: Real World Preasymptotics, Epistemology, and Applications (The Technical Incerto Collection) Nassim Nicholas Taleb (arXiv preprint, STEM Academic Press) · 2020 Own record

   “11.2 Spurious overestimation of tail probability in psychology”

8. E8 Thinking Fast and Slopes Dror Poleg (drorpoleg.com) · 17 April 2023

   “Now, what Nassim says, and correctly, is, “You can't tell — you really cannot estimate those tail probabilities.””

9. E9 SKIN IN THE GAME 3 (Map of the Incerto, preliminary draft) fooledbyrandomness.com (N. N. Taleb) Own record

   “lack of focus on fat tails, psychologists of uncertainty typically confuse the two”

10. E10 Human Judgement is Heavy Tailed: Empirical Evidence and Implications for the Aggregation of Estimates and Forecasts INSEAD · 7 July 2010

    “The authors find incontrovertible evidence for excess kurtosis, that is, of fat tails.”

11. E11 The Psychology of Tail Events: Progress and Challenges - American Economic Association American Economic Review (American Economic Association) · May 2013

    “Over the past decade there has been a surge of interest in "tail events," or rare, high-impact events.”

The only sources saying Kahneman acknowledged the fat-tails problem are Taleb's own account (E1, E5), and the independent blog post (E8) does not name the speaker. The independent research (E10, E11) does not show that its authors are psychologists or that they acknowledged the problem, and E4 is dated after the claim, so the evidence does not show that several other psychologists did so.