Taleb warned that financial theories, financial-risk managers and quantitative finance practitioners were dangerous to society.

True: Taleb's writings, interviews or talks dated before 12 January 2009 explicitly warn that financial theories (such as VaR or modern portfolio theory), financial-risk managers or quantitative finance practitioners and models were dangerous, harmful or a threat to society or the financial system. Mostly true: such warnings exist before that date but are aimed mainly at the financial system or investors rather than 'society', or cover only some of the named targets. Mixed: before that date he criticised these targets as wrong or flawed, but only loosely or occasionally framed them as dangerous. Mostly false: his criticism before that date was only about their being inaccurate, with no warning about danger or harm. False: dated records show he made no such criticism before January 2009, or that he first raised it only after that date.

Set before the research began.

1. E1 Nassim Nicholas Taleb | StockEducation StockEducation · 14 October 2026

   “In 1997, in the trade magazine Derivatives Strategy, Taleb called VaR dangerous, pointing to market moves of 7 to 30 standard deviations, which a bell curve treats as all but impossible.”

2. E2 Nassim Nicholas Taleb: Blame the Bystanders to the Meltdown CBS News · 8 December 2008 Own record

   “the risk management specialists who "knew that quantitative methods -- like those used to measure and forecast exposures, value complex derivatives and assign credit ratings -- did not work and could provide undue comfort by hiding risks."”

3. E3 newsweek Newsweek (reprinted by the author's site, fooledbyrandomness.com) · 24 November 2008 Own record

   “The risk models these hedge funds run aren't reliable. Business schools should stop teaching them.”

4. E4 Nassim Taleb's Black Swan efalken.com (Eric Falkenstein) · 6 July 2007

   “Taleb’s career as a talking head started in 1996 when, as the author of a niche derivatives text, his claim in Derivatives Strategy magazine that the new Value-at-Risk phenomenon was worse than useless made for great debate in risk management circles.”

E1, an independent source, reports that in 1997 Taleb called VaR "dangerous" in Derivatives Strategy. E4, another independent source, dates his 1996 claim that VaR was "worse than useless." E2 and E3, both from late 2008 and before the claim date, show him saying that risk managers' quantitative methods hid risks and that risk models should no longer be taught. These are warnings that came before the claim date. However, the evidence calls these tools dangerous, unreliable or prone to hiding risks without explicitly saying they were a danger to "society", which matches the mostly-true criterion.